WO2018015440A1 - Module pour montre-bracelet munie d'une indication mécanique de direction - Google Patents

Module pour montre-bracelet munie d'une indication mécanique de direction Download PDF

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Publication number
WO2018015440A1
WO2018015440A1 PCT/EP2017/068236 EP2017068236W WO2018015440A1 WO 2018015440 A1 WO2018015440 A1 WO 2018015440A1 EP 2017068236 W EP2017068236 W EP 2017068236W WO 2018015440 A1 WO2018015440 A1 WO 2018015440A1
Authority
WO
WIPO (PCT)
Prior art keywords
module
information
wristwatch
display
calculating
Prior art date
Application number
PCT/EP2017/068236
Other languages
German (de)
English (en)
Inventor
Pascal Stübi
Moritz RITTER
Original Assignee
Pascal Stübi
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pascal Stübi filed Critical Pascal Stübi
Publication of WO2018015440A1 publication Critical patent/WO2018015440A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/0009—Transmission of position information to remote stations
    • G01S5/0072—Transmission between mobile stations, e.g. anti-collision systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
    • G01C21/20—Instruments for performing navigational calculations
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C17/00—Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes
    • G01C17/02—Magnetic compasses
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B47/00—Time-pieces combined with other articles which do not interfere with the running or the time-keeping of the time-piece
    • G04B47/06—Time-pieces combined with other articles which do not interfere with the running or the time-keeping of the time-piece with attached measuring instruments, e.g. pedometer, barometer, thermometer or compass

Definitions

  • the invention relates to the field of modules for wristwatches, which comprise a mechanical display in the direction of a predetermined target. It relates to a module according to the preamble of claim 1. Such a module is known for example from DE 199 46 169 AI. Therein is disclosed a device comprising a compass and a satellite navigation system. Through a location determination by the satellite navigation system and the digital compass, the device can calculate the direction of a destination and indicate mechanically or electromechanically in a wristwatch by means of a pointer.
  • Such devices have the disadvantage that they require a lot of energy.
  • a wristwatch with such a device needs a large battery or needs to be charged frequently.
  • such devices and thus the watches are large and / or difficult. They are also complicated and contain many items. As a result, such devices are prone to failure and expensive.
  • the satellite navigation system and the compass can interfere with each other by the respective electromagnetic requirements.
  • a module for incorporation into a wristwatch comprising a compass, a computing means, a direction indicator for a mechanical direction indicator, and a module communication means for wireless communication with a second device.
  • the computing means may obtain orientation information from the compass in order to perform a calculation of a display direction in the direction of a predetermined destination.
  • the direction indicating means may obtain the display direction from the calculating means to indicate the direction of the predetermined destination by the mechanical direction indication.
  • the calculation means is designed such that it can receive a second device information through the module communication means via the wireless communication with the secondary device, and that it can determine a position information about the position of the second device from the second device information.
  • the calculation means for calculating the direction of the predetermined target uses the position information on the position of the secondary device.
  • position information about the position of the secondary device can be used to calculate the direction of the predetermined target (i.e., the display direction), rather than the module itself having to determine position information about the position of the module.
  • the wireless communication with the secondary device position information is available quickly, easily and with little effort. This allows the module to calculate the direction of a predetermined target with little energy and to send that information to the direction indicator to ultimately provide directional indication.
  • position information of an object is meant information about a geographical position of this object. So an information about a spatial position of the object. In particular, this means coordinates of the object, that is about Longitude and latitude. Or about information to identify an object whose geographical location is known and can be determined by the identification information.
  • the position information relates in particular only to suborbital objects.
  • the position information does not have to be determined by and / or in the module, which is why the module comprises fewer components and has a simpler structure. Also, a small power source or a small battery is sufficient to operate the module, and / or the power source rarely needs to be replaced, or refilled or charged.
  • the module is simple and robust. The module can be manufactured inexpensively. The compass of the module is free from degradation by the position determining means.
  • the compass is a device with which a particular direction and in particular a direction is determined.
  • the compass is designed, for example, as a magnetic, electronic, electromagnetic compass or gyrocompass.
  • the compass thus determines a direction and can provide appropriate orientation information.
  • the orientation information includes, for example, at least one compass direction such as North.
  • the calculation means is a means for calculating result values from output values, such as for calculating the display direction from the position information of the secondary device and the orientation information of the compass.
  • the module communication means is for wireless communication with a second device.
  • the wireless communication is in particular a medium- and / or short-range communication connection.
  • wireless communication may be via WLAN, Bluetooth, ZigBee, NFC or infrared.
  • Other wireless communication paths are conceivable.
  • another than the above-mentioned radio links is possible.
  • medium- and / or short-range communication links it can be assumed that the secondary device is not far away from the module and thus the position or the position information of the secondary device is not far removed from that of the module.
  • the error of the direction indication of the mechanical display device of the module is small and can be neglected (for an absolutely accurate direction indication by the directional means of the module in the destination direction calculation would have the position information of the module instead of the Second device can be used).
  • the secondary device is at most 20 kilometers away from the module.
  • the branch can also be up to 500 meters away from the module.
  • the secondary device is a maximum of 10 meters away from the module.
  • the second device is a device not included in the module, which is designed so that it is capable of communicating with the communication means of the module.
  • the secondary device can provide a second device information.
  • the second device information includes position information. This position information can be used to determine the position of the secondary device.
  • the secondary device can be, for example, a device which is designed to be able to determine its own current position and to make it available in its position information.
  • the secondary device can be, for example, a mobile phone, smartphone, a tablet, a computer, a GPS receiver or another device with its own position determination.
  • the secondary device can also be a device with a known position, whereby the position of the device is determined by an identification of the device by the secondary device information can be.
  • a WLAN transmitter or a beacon can provide second device information with identification information (number, code, serial number, device name or the like), wherein the calculation means can close by data matching with the identification information on a position of the second device (for example in a list of known and mapped wireless stations or beacons looking for their position ie place).
  • identification information number, code, serial number, device name or the like
  • the direction indicating means is adapted to enable a mechanical direction indication.
  • the direction-indicating means may be a drive means and in particular a stepper motor which drives a mechanical direction indicator.
  • the mechanical direction indicator can be formed outside the module, and be included for example by the wristwatch.
  • the direction indicator may drive about a wristwatch hand or a bezel or template of the wristwatch.
  • the module or even the direction-indicating means may, for example, also comprise the pointer, steady rest and / or template and thus the mechanical direction indication.
  • a mechanical direction indicator is understood to mean a device which can point in one direction by means of a mechanical movement. This may be about a pointer, which is moved until it points in the direction to be pointed. Or about an imaginary connection of at least two points, wherein at least one of these points by means of mechanical means is formed - for example, as the first point an imaginary center of a mechanical bezel and as a second point a recess, marking or elevation in the mechanical bezel, said Connection from the first imaginary point with the second, mechanically trained point indicating the direction. The bezel is then moved until the direction to be pointed is displayed.
  • Electromechanical direction indicators may include mechanical direction indicators. Pure displays on displays such as pointers shown in LCD displays are not counted as mechanical displays, as well as ads exclusively based on luminous lamps or diodes without mechanical movement of the same.
  • a mechanical component which serves to display the direction is moved.
  • the movement can be proportional to the change in direction.
  • the movement of the mechanical component takes place, for example, mechanically or electromechanically.
  • Mechanical direction indicators are easy and quick to read. Even under adverse conditions (for example, poor or little light, too much light, reflections and reflections, poor visibility, rain or storm and the like), a mechanical direction indicator can be read reliably.
  • a mechanical direction indicator for example, can also be designed such that it can be tactually detected. In case of poor eyesight or blindness or in particular in case of long-sightedness, such a mechanical direction indicator without visual aid can be read tactilely.
  • the predetermined destination of the module is Mecca. More precisely, the predetermined destination may also be the location of the Kaaba (Quibla). In this way, if necessary, at any time the direction of Mecca or the Kaaba on the wristwatch can be retrieved from the module and displayed mechanically. This is especially important before the five daily Islamic prayer times (salat) to determine the direction of prayer. In this way, the module and the watch can be used as a prayer watch.
  • a destination other than Mecca may be chosen as a predetermined destination. For example, it is also possible to select a series of destinations which can be reached one after the other in order to follow a predetermined path in this way.
  • the module comprises a triggering means and is designed such that the module communication means determines the second-device information only when the triggering means is activated.
  • Energy can be saved by querying the secondary device information only when necessary, that is, when the triggering means is activated.
  • the triggering means can be activated manually.
  • the trigger can also be activated automatically.
  • the triggering means may be automatically activated at predetermined times, such as before or during prayer times.
  • the secondary device information can, for example, also be determined automatically without triggering means (for example at predefined times such as before or during prayer times) and / or regularly by the module communication means.
  • the calculation means is designed such that it can determine a time information from the second-device information.
  • the module has the correct time. This is an advantage in order to provide the wristwatch with the correct time so that it runs correctly. This is also advantageous when switching from one time zone to another, because the time information can automatically and reliably supply the module and thus also the wristwatch with the respectively correct local time.
  • the module can be operated without determining a time information from the second device information. Time information may also come from a different source than from the second device information, such as the wristwatch or a radio clock receiver or a third party device.
  • the module comprises a time-indicating means capable of displaying predetermined times.
  • the calculation means uses the position information for the position of the second device to calculate the predetermined times.
  • the time-mean for predetermined times may indicate the five daily Islamic prayer times (salads).
  • the time-keeping means is in particular designed to enable a mechanical time display (analogous to the mechanical direction indicator).
  • the time-indicating means is designed as a drive and / or it comprises a mechanical time display.
  • the knowledge of the position information is thus advantageous in combination with the display in the direction of Mecca, because it can be determined for any location always the correct Islamic prayer time and the right prayer direction.
  • the calculation means can calculate the desired prayer times reliably and automatically independently and without further information on the basis of the current time, the position information and the calculation means available stored data.
  • the computing means may determine the Islamic prayer times and the module or the Wristwatch can convey a note or alarm reminding of a prayer time.
  • the display direction can also be calculated and displayed mechanically at the same time.
  • the module can determine correct prayer times as well as the correct prayer direction. This can be done automatically. The module thus allows easy information on prayer times and prayer direction.
  • the module may be formed without timing means for predetermined times.
  • prayer times can also be brought to the knowledge differently than via a display, for example via acoustic and / or tactile stimuli.
  • the predetermined times can be dispensed with, for example, the position information to the position of the secondary device.
  • the calculation means may also use the time information to calculate the predetermined times.
  • the time information can also be used for the accurate calculation of the Islamic prayer times - when using the time information provided by the second device, the calculated prayer time is based on the automatically obtained current time, which is security (no prayer times falsified due to wrong times ) and comfort increased.
  • the current time can be automatically corrected by the time information as needed, increasing the reliability and accuracy of the prayer times.
  • the module can determine correct prayer times as well as the correct prayer direction. This can be done automatically.
  • the module thus allows a reliable, safe, simple and very accurate information on prayer times and the direction of prayer.
  • the calculation means for calculating the predetermined times may also omit the time information and use only the current time of the wristwatch.
  • the predetermined times are Islamic prayer times.
  • the predetermined times are the five daily Islamic prayer times (salat).
  • the module comprises a celestial body means.
  • the calculating means uses the position information to calculate a sky state of a celestial body, and the celestial means of the celestial body indicates the celestial state of the celestial body.
  • skystand is meant a position of the celestial body over a landscape horizon of the respective location.
  • sky height means the height of the celestial body over the landscape horizon.
  • the sky state can also be merely the information as to how far the celestial body is visible over the landscape horizon.
  • the skystand may be the information as to whether the sun is rising or setting and how far the sun is above the landscape horizon.
  • the celestial body-indicating means can also be designed to enable a mechanical display (in this case, a mechanical indication of the celestial state of a celestial body).
  • the Himmelsterrorism selfesch may be a drive for a mechanical celestial display and / or the latter include.
  • the module can also be designed without Himmelsêtesch.
  • the sky state of a celestial body is calculated by the calculating means based on the position information and the current time.
  • the calculation means for calculating the sky state of the celestial body also uses the time information. Thanks to the time information, the current time is determined accurately and automatically. However, the calculation means can also use only the current time of the wristwatch without the time information being used.
  • the celestial body is the sun, and the celestial celestial indicates the position of the sun. This is particularly beneficial for observing Lent in Ramadan (Islamic Lent), where fasting continues from sunrise to sunset.
  • the invention also includes a wristwatch with a module as described above.
  • Wristwatch is a watch, meaning a timepiece, which is worn attached to the wrist.
  • the watch includes a quartz movement.
  • the watch may also include a mechanical movement.
  • the watch may include an electromechanical movement.
  • the wristwatch includes an electronic movement.
  • the invention also includes a system comprising a wristwatch as described above and a secondary device.
  • the second device of the wristwatch is separately formed.
  • the second device comprises a second device communication means for transmitting the second device information through the wireless communication to the module communication means.
  • the second device details and embodiments have already been described above. Likewise, the benefits of the watch and the module also apply to this system.
  • the second device is a mobile phone, such as a smartphone.
  • a mobile phone usually has the necessary wireless communication means for communication with the module as well as the above-described second device information.
  • the second device may be another device (such as a tablet, a computer, a GPS receiver, a WLAN transmitter, or a beacon listed above, for example).
  • the invention also includes a method for determining a display direction, comprising the following steps:
  • Figure 1 is a module
  • Figure 2 shows a system comprising a second device and a wristwatch with
  • FIG. 1 shows a module 1 which comprises a direction-indicating means 2, a calculation means 3, a compass 4 and a module communication module 5.
  • This module 1 is designed for installation in a wristwatch.
  • the directional means 2 is a stepping motor, which via a switchable on and off translation a not belonging to the module 1 pointer of the module 1 comprehensive wristwatch can drive as needed. If necessary (ie, when the display direction is to be displayed), the wrist watch pointer is mechanically rotated by the stepping motor, that is, the direction indicating means 2, until the pointer points in the direction of the predetermined target and thus faces in the display direction.
  • the compass 4 is designed as a Hall sensor. In order to calculate the display direction, the compass 4 provides the computing means 3 with orientation information in the form of information about the cardinal directions relative to the module 1. And the module communication module 5 provides the computing means 3 with a second device information which wirelessly transmits the module communication module 5 from a secondary device Communication has received - in this specific case via Bluetooth from a smartphone.
  • the calculating means 3 is a semiconductor chip and determines, from the second-device information, position information about the secondary device;
  • the smartphone has transmitted to the computing means 3 in the second device information the longitude, latitude and altitude above the smartphone.
  • the calculating means 3 reads out the corresponding values from the second-party information and calculates an absolute direction for the position of the smartphone, pointing in the direction of Mecca. This absolute direction is compared by the computing means 3 with the orientation information of the compass 4 to determine a display direction for the direction indicator 2.
  • the direction display means 2 receives from the calculation means 3, if necessary, all necessary information to be able to display the display direction.
  • the calculating means 3 calculates the necessary number of steps of the stepping motor and transmits this information to the motor control included in the stepping motor.
  • FIG. 2 shows a system 10 which, in addition to a wristwatch 11 with a built-in module, also comprises a smartphone 12.
  • the wristwatch 11 comprises a quartz movement, the hour hand 13, the minute hand 14 and the second hand 15.
  • the wristwatch 11 has a compass direction display 16, a prayer time display 17, a sun position display 18 and a function button 19.
  • the built-in in the wristwatch 11 module comprises all components of the module 1 of Figure 1, and in addition also a triggering means, a time-indicating means and a Himmelsterrorism accordesch.
  • the wristwatch 11 displays the time controlled by the quartz movement by means of the second hand 15, minute hand 14 and hour hand 13.
  • the compass direction display 16 may obtain the information about the current orientation of the wristwatch 11 relative to the cardinal directions from the compass of the module, and indicates the cardinal directions as needed.
  • the prayer time display 17 has a pointer which may point to five different symbols (which symbolize the five daily Islamic prayer times salat) or may refer to it in between.
  • the prayer time display 17 of the wristwatch 11 is driven by the time-counting means of the module.
  • the prayer times are calculated by the calculation means in the module and are based on the current time of the quartz plant and the last stored position information.
  • the sun position display 18 includes a small rotating disk with a sun symbol in front of a backdrop, through which the sun symbol can be partially or completely covered. Depending on the position of the rotating disk, the sun symbol is completely, partially or not at all visible and thus shows the position of the sun in the sky.
  • the sun position indicator 18 of the wristwatch 11 is driven by the sky body display means of the module. The calculation of the position of the sun is made by the calculation means in the module and is based on the current time of the quartz plant and the last stored position information.
  • the triggering means of the module When pressing the function button 19, the triggering means of the module is activated, and the module communication means of the module takes via Bluetooth with the second device, so the smartphone 12 contact. From the smartphone 12, the module communication means of the module receives the second device information and transmits it to the computing means of the module. From the second device information, the calculation means determines the position information and thus the position of the smartphone 12 as already described above in FIG. As already described above, the calculation means of the module calculates the display direction and allows the directional means of the module - so the stepper motor - via a now switched translation show both the minute hand 14 and the hour hand 13 superimposed in the direction of Mecca. After a period of 5 seconds, the direction indicator means of the module returns the minute hand 14 and the hour hand 15 to their original position and the translation to the direction indicator is switched off again.
  • the calculating means From the second device information as a result of activation of the triggering means, the calculating means also determines the time information and sets the watch of the wristwatch to the correspondingly updated time, which results in an exact current time of the quartz movement.

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)
  • Electric Clocks (AREA)

Abstract

L'invention concerne un module (1) destiné à être intégré dans une montre-bracelet (11) munie d'une indication mécanique de direction d'une destination prédéterminée, comprenant une boussole (4), un moyen de calcul (3), un moyen d'indication de direction (2) pour une indication mécanique de direction (13, 14), et un moyen de communication modulaire (5) permettant une communication sans fil avec un deuxième appareil (12). Le moyen de calcul (3) reçoit de la boussole (4) une information d'orientation pour le calcul d'une direction d'indication en direction d'une destination prédéterminée. Le moyen d'indication de direction (2) reçoit du moyen de calcul (3) la direction d'indication reçue pour indiquer la direction de la destination prédéterminée par l'indication mécanique de direction (13, 14). Le moyen de calcul (3) reçoit par le moyen de communication modulaire (5) via la communication sans fil avec le deuxième appareil (12) une information sur le deuxième appareil, et détermine à partir de l'information sur le deuxième appareil une information de position concernant la position du deuxième appareil (12). Le moyen de calcul (3) utilise l'information de position concernant la position du deuxième appareil (12) pour calculer la direction de la destination prédéterminée. L'invention concerne également une montre bracelet (11) munie dudit module (1) et un système muni de la montre-bracelet (11) comportant le module (1), ainsi qu'un deuxième appareil (12).
PCT/EP2017/068236 2016-07-20 2017-07-19 Module pour montre-bracelet munie d'une indication mécanique de direction WO2018015440A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH00938/16 2016-07-20
CH00938/16A CH712725B1 (de) 2016-07-20 2016-07-20 Modul zum Einbau in eine Armbanduhr, umfassend ein Richtungszeigemittel für eine mechanische Richtungsanzeige.

Publications (1)

Publication Number Publication Date
WO2018015440A1 true WO2018015440A1 (fr) 2018-01-25

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PCT/EP2017/068236 WO2018015440A1 (fr) 2016-07-20 2017-07-19 Module pour montre-bracelet munie d'une indication mécanique de direction

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WO (1) WO2018015440A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3644138A1 (fr) * 2018-10-23 2020-04-29 ETA SA Manufacture Horlogère Suisse Piece d'horlogerie pouvant indiquer la position du soleil par rapport a l'horizon en tout point du globe

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997048025A1 (fr) * 1996-06-10 1997-12-18 Asulab S.A. Montre de precision portable
DE19946169A1 (de) 1999-09-27 2001-04-05 Heyner Klaus Gerät zur Anzeige von Standort und Richtung zu gewünschten Zielorten
DE102005024760A1 (de) * 2005-05-31 2006-12-07 Aziz Bousfiha Verfahren, um basierend auf Globalen Naviagtionsysteme, wichtige Daten religiöser Verpflichtungen anzugeben
US20130257650A1 (en) * 2012-03-27 2013-10-03 Casio Computer Co., Ltd. Altitude information acquiring device and altitude information acquiring system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997048025A1 (fr) * 1996-06-10 1997-12-18 Asulab S.A. Montre de precision portable
DE19946169A1 (de) 1999-09-27 2001-04-05 Heyner Klaus Gerät zur Anzeige von Standort und Richtung zu gewünschten Zielorten
DE102005024760A1 (de) * 2005-05-31 2006-12-07 Aziz Bousfiha Verfahren, um basierend auf Globalen Naviagtionsysteme, wichtige Daten religiöser Verpflichtungen anzugeben
US20130257650A1 (en) * 2012-03-27 2013-10-03 Casio Computer Co., Ltd. Altitude information acquiring device and altitude information acquiring system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3644138A1 (fr) * 2018-10-23 2020-04-29 ETA SA Manufacture Horlogère Suisse Piece d'horlogerie pouvant indiquer la position du soleil par rapport a l'horizon en tout point du globe
JP2020067449A (ja) * 2018-10-23 2020-04-30 ウーテーアー・エス・アー・マニファクチュール・オロロジェール・スイス 世界中のどこにおいても水平線に対する太陽の位置を示すことができる計時器
CN111090230A (zh) * 2018-10-23 2020-05-01 Eta瑞士钟表制造股份有限公司 能够指示世界上任何地方的太阳相对于地平线的位置的钟表
US11550266B2 (en) 2018-10-23 2023-01-10 Eta Sa Manufacture Horlogere Suisse Timepiece capable of indicating the position of the sun with respect to the horizon anywhere in the world

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Publication number Publication date
CH712725A2 (de) 2018-01-31
CH712725B1 (de) 2020-12-30

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