DE327064C - Measuring telescope with target cross - Google Patents
Measuring telescope with target crossInfo
- Publication number
- DE327064C DE327064C DE1919327064D DE327064DD DE327064C DE 327064 C DE327064 C DE 327064C DE 1919327064 D DE1919327064 D DE 1919327064D DE 327064D D DE327064D D DE 327064DD DE 327064 C DE327064 C DE 327064C
- Authority
- DE
- Germany
- Prior art keywords
- orbits
- target cross
- target
- telescope
- fixed stars
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
Classifications
-
- 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
- G01C21/02—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 by astronomical means
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Astronomy & Astrophysics (AREA)
- Automation & Control Theory (AREA)
- General Physics & Mathematics (AREA)
- Telescopes (AREA)
Description
1Vießfernrohr mit Zielkreuz. Die Fixsterne bewegen sich scheinbar in kreisförmigen Bahnen um d'en Himmelspol, die sie alle mit. gleicher und gleichbleibender Winkelgeschwindigkeit durchlaufen. - Einige von ihnen haben so geringen Polabstand, daß ihre Bahnen völlig im Gesichtsfeld eines auf den Pol gerichteten Beobachtungsfernrohrs erscheinen.1 Sighting telescope with target cross. The fixed stars seem to be moving in circular orbits around d'en celestial pole, which they all with. the same and more consistent Run through angular velocity. - Some of them have such a small pole spacing, that their orbits are entirely within the field of view of an observation telescope aimed at the pole appear.
Ist das Beobachtungsfernrohr in der Bildebene des Objektivs außer mit dem üblichen Zielkreuz (Fadenkreuz) mit konzentrischen Kreisen um den Kreuzmittelpunkt ausgestattet, die den Bahnen solcher polnaher Fixsterne entsprechen, so müssen entweder, wenn die Ziellinie durch den Himmelspol geht, diese Fixsterne auf den ihren Bahnen entsprechenden Kreisen erscheinen, oder wenn die Fixsterne sich auf den ihren Bahnen entsprechenden Kreisen bewegen, dann muß die Ziellinie durch den Himmelspol gehen.Is the observation telescope except in the focal plane of the lens with the usual target cross (crosshair) with concentric circles around the center of the cross equipped that correspond to the orbits of such near-polar fixed stars, either when the finish line goes through the celestial pole, these fixed stars on their orbits corresponding circles appear, or when the fixed stars are on their orbits move corresponding circles, then the finish line must go through the celestial pole.
Jeder Fixstern braucht, um seine Bahn einmal zu durchlaufen, einen Sterntag. Wird der Winkelraum um den Zielpunkt oder den Mittelpunkt der Fixsternbahnen entsprechend. eingeteilt, so kann an dieser Teilung wie am Zifferblatt einer Uhr jeweils die Sternzeit abgelesen werden, die seit der letzten Kulmination der- einzelnen beobachteten polnahen Fixsterne verflossen ist.Every fixed star needs one to travel through its orbit once Sidereal day. Becomes the angular space around the target point or the center of the fixed star orbits corresponding. divided, so can at this division as on the dial of a clock read the sidereal time since the last culmination of each observed near-polar fixed stars has passed.
Infolge der Präzession ändern sich die Radien der scheinbaren Fixsternbahnen. Um das Zielbild für eine Reihe von Jahren verwendbar zu machen, können für jeden der zu beobachteten polnahen Fixsterne einige konzentrische Kreise vorgesehen werden, die,den Bahnen gewisser Zeitintervalle entsprechen.As a result of the precession, the radii of the apparent fixed star orbits change. To make the target image usable for a number of years, anyone can a few concentric circles are provided for the observed fixed stars close to the poles, which correspond to the orbits of certain time intervals.
Derartige aus Zielkreuz, konzentrischen Kreisen und Sternzeitteilung bestehende Zielbilder werden auf dünne Glasplatten photographiert und sonst wie Fadenkreuze zwischen Fernrährobjektiv und -okular eingeschaltet.Such from target cross, concentric circles and sidereal time division existing target images are photographed on thin glass plates and otherwise Crosshairs switched on between telescope objective and eyepiece.
Solche Zielbilder ermöglichen es. also nicht nur, die errechnete Richtung der Himmelsachse nachzuprüfen, sondern auch dieselbe ohne weitschweifende Rechnung durch einfaches Zielen festzustellen und ferner jeweils die seit der letzten Kulmination der beobachteten Fixsterne verstrichene Sternzeit abzulesen.Such target images make it possible. so not only the calculated direction to check the celestial axis, but also the same without rambling calculation by simple aiming and also those since the last culmination read the elapsed sidereal time of the observed fixed stars.
Das in der Zeichnung -dargestellte und für den Nordpol und etwa 15jährige
Verwendungs-d'auer bestimmte Zielbild enthält außer dem Zielkreuz und eer Zeitrose
die Bahnen zweier polnaher Fixsterne, und zwar die des: Sternes 2-ter Größe a ursae
minoris, Rektaszension 192o
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE327064T | 1919-11-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE327064C true DE327064C (en) | 1920-10-08 |
Family
ID=6184568
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1919327064D Expired DE327064C (en) | 1919-11-29 | 1919-11-29 | Measuring telescope with target cross |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE327064C (en) |
-
1919
- 1919-11-29 DE DE1919327064D patent/DE327064C/en not_active Expired
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