JPS6331147Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to a sidereal time slide rule suitable for converting solar time to sidereal time.

<Conventional technology> Generally speaking, sidereal time is used for astronomical observations in contrast to the solar time that we use in our daily lives. A quick reference table of constellations as shown in Publication No. 16048 has been proposed.

<Problem that the invention aims to solve> However, such a conventional constellation chart equivalent to a slide rule has a date for one year and a scale for 24 hours a day on the circumference of the circle, so the scale is not accurate. The scale tends to be coarse, and the roughness of the scale inevitably causes variations in sidereal time after conversion.

<Means for Solving the Problems> The configuration of this invention for achieving the above object will be explained below using FIGS. 1 to 3 corresponding to the embodiment. Slide rule body 1 of this sidereal time slide rule
has a substantially elongated shape, and mainly consists of a base scale 2 and a medium scale 3 that slides along the base scale 2.

One side (front side) of the platform 2 shows the calendar days from January 1st to June 30th, and the other side (back side) shows the calendar days from July 1st to December 31st, excluding the above calendar days. Days are provided at equal intervals as calendar day scales 4. and the end of the calendar day scale 4, that is, the calendar day scale 4 in the case of the surface.
January 1st and June 30th, and July 1st on the reverse side.
An east longitude coordinate scale 5 is marked on the lower part 2b corresponding to the day and December 31st.

On Chushaku 3, Japanese time scale 6 and sidereal time scale 7 are provided at equal intervals as "solar time", and Japanese time scale 6 is used for the night time from evening to dawn when stars can be observed. It is used as a scale. Sidereal time scale 7, on the other hand, is a scale that divides 24 hours of sidereal time into half days (12 hours).

<Effect> Next, the action will be explained.

Depending on the observation date and observation time for astronomical observation, the corresponding date on the calendar day scale 4 of Daishiku 2 and the Japanese time scale 6
and sidereal time scale 7 at the perpendicular position.
[See imaginary line X in Figure 3].

Next, adjust the read sidereal time scale 7 to the east longitude (135 degrees east longitude) of Japan Standard Time. Then, the sidereal time scale 7 is read at the perpendicular position of the east longitude of the relevant observation location (for example, about 140 degrees in the case of Tokyo), and the sidereal time is corrected for differences in observation locations.

In this way, the relevant observation date, observation time,
This allows conversion between solar time and sidereal time at the observation location (east longitude position).

<Embodiment> An embodiment of this invention will be described below with reference to FIGS. 1 to 3. The slide rule main body 1 of this sidereal time slide rule has a substantially elongated shape, and both the front and back sides are used. Fig. 1 shows one side (front side), and Fig. 2 shows the other side (back side). Shaka 2 and this Daishaku 2
The longitudinal direction of the platform scale 2 [direction of arrow X], that is, Figs.
It mainly consists of a medium length 3 that slides along the left and right directions in the figure.

The upper part 2a and the lower part 2b of the platform scale 2 are made of plastic, transparent or translucent resin, etc., and are arranged facing each other at a constant interval by known means. Half-year calendar day scale 4
However, there is an east longitude coordinate scale 5 on the lower part 2b,
Each is provided. That is, the upper side 2a of one side (front side) of the slide rule main body 1 shows the calendar days from January 1st to June 30th, and the upper side 2a of the other side (back side) shows the calendar days excluding the above mentioned calendar days. Calendar days from the 1st of the month to the 31st of December are set at equal intervals for each day as a calendar day scale 4. And the ends of the calendar day scale 4 on the upper part 2a, that is, the 1 of 4 at both ends of the calendar day scale on the surface.
135 on the lower part 2b corresponding to the 1st day of the month and the 30th day of June, or on the back side, the 1st day of July and the 31st day of December at both ends.
The east longitude coordinate scale 5 is calibrated at a position such that the east longitude (Japan Standard Time) is located. The east longitude coordinate scale 5 in this embodiment is provided at equal intervals of 1 degree in the range of 130 degrees to 145 degrees east longitude.

On the middle scale 3, a Japanese time scale 6 and a sidereal time scale 7 are marked at equal intervals as "solar time". The Japanese time scale 6 is a scale only for the nighttime period from evening until dawn when stars can be observed, specifically, the nighttime period from 5 p.m. to 6 a.m. the next morning.
And this Japanese time scale 6 is at the top in the vertical direction,
That is, it is provided near the calendar date scale 4 on the upper side 2a of the platform scale 2.

On the other hand, the sidereal time scale 7 includes an A scale scale 8 and a B scale scale 9 provided on one side (front side) of the slide rule body 1, and a C scale scale 1 provided on the other side (back side).
It consists of 0 and D scale scales 11. The A-scale scale 8 is graduated from midnight to 13:00 in the afternoon from the right side to the left side in FIG. Originally, the 24-hour sidereal time was divided into half days, from midnight to midnight.
12 hours (sidereal time) is sufficient, but considering the extraordinary difference when using a slide rule, as mentioned above, from midnight to noon.
13:00, and the B scale scale 9, C scale scale 10, and D scale scale 11 described below are also scales for half a day (12 hours) or more for the same reason. The B scale scale 9 uses the same "scale" as the A scale scale 8, and the first scale is from 12:00 noon to 1:00 p.m.
The scale runs from the right side to the left side of the figure.
C scale scale 10 is from 11 o'clock in the day to midnight, and D
The scale scale 11 is the same "scale" as the C scale scale 10.
23:00 to 12:00 noon, respectively, are scaled from the right side to the left side of Figure 2. And, this sidereal time scale 7 and Japan time scale 6 are 5 o'clock in the morning of Japan time scale 6, A scale scale 8 and D
11:40 in the morning on scale scale 11, then B scale scale 9
and C scale scale 10, 23:40 at night, are aligned.

As mentioned above, the calendar day scale 4 is divided into half years and is displayed on both the front and back sides of the platform scale 2, the Japanese time scale 6 is displayed only at night when stars can be observed, and the sidereal time scale 7 is divided into 12 hours (12 hours). The conversion date scale for solar time - sidereal time conversion (calendar day scale 4, Japanese time scale 6, and sidereal time scale 7) is divided into half days), so even if each of the conversion date scales (calendar day scale 4, Japanese time scale 6, and sidereal time scale 7) is finely scaled, the scale is large and easy to read. Furthermore, one of the major features of this invention is that the scale, which was conventionally graduated in a circular shape, equivalent to a slide rule for converting solar time to sidereal time, was arranged in an elongated shape, making it easier to see and convert. be.

Next, we will explain how this sidereal time slide rule is used.

Depending on the observation date and observation location for astronomical observation, the corresponding date on the calendar day scale 4 of Taishaku 2 (for example, July 7th)
and Japanese time scale 6 (for example, 3:50 in the morning). Then, read the sidereal time scale 7 (for example, 10:30) at the perpendicular position [see imaginary line Y in Figure 3].

Next, read the sidereal time scale 7 (for example, 10
30 minutes) to the East longitude (135 degrees East) of Japan Standard Time. Then, it reads the sidereal time scale 7 (for example, 11:50) perpendicular to the east longitude of the relevant observation location (for example, approximately 140 degrees in the case of Tokyo) and corrects the sidereal time due to the difference in the observation location, that is, the east longitude position. It is. If the observation location is Akashi City (135 degrees east longitude), there is no need to correct the sidereal time due to the shift in east longitude position [see Figure 3].

In this way, the relevant observation date, observation time,
This will facilitate conversion between solar time and sidereal time at the observation location (east longitude position).

In the example, for convenience of explanation, Japan time is used as solar time, and east longitude 130 is used as east longitude coordinate scale 5.
Although the range from 145 degrees to 145 degrees has been described, it is needless to say that the range is not limited to this.

Also, if the observation location is fixed,
If you mark a line in advance on the surface of the transparent or semi-transparent resin connecting the upper part 2a and lower part 2b of the platform scale 2 at the corresponding east longitude position and the standard east longitude,
Sidereal time is easy to read.

<Effects> Since the sidereal time slide rule of this invention has the content as explained above, the calendar day scale is provided on both the front and back sides of the slide rule every six months, and the solar time scale is set at night when stars can be observed. limited to the hours of
Furthermore, by dividing the sidereal time scale into half days (12 hours), the above synergistic effect allows the conversion scale for solar time to sidereal time to be made into a large, easy-to-read scale even though it is finely scaled. Also, since the scale can be made finer, the converted sidereal time can be made more accurate, and the scale, which used to be circular, has been arranged in an elongated shape, making it easier to read. There is.

[Brief explanation of the drawing]

Figure 1 is a schematic explanatory diagram showing one side (front side) of the sidereal time slide rule according to this invention, Figure 2 is a schematic explanatory diagram equivalent to Figure 1 showing the other side (back side), and Figure 3 is a schematic explanatory diagram showing the other side (back side). FIG. 2 is a schematic explanatory diagram corresponding to FIG. 2 showing a state of use. 1...Slide rule body, 2...Base rule, 3...Medium scale,
4... Calendar day scale, 5... East longitude coordinate scale, 6...
...Solar time (Japan time), 10... Sidereal time scale.

Claims (1)

[Scope of Claim for Utility Model Registration] A six-month calendar day scale on the front scale of the long slide rule body, and a six-month calendar day scale excluding the aforementioned calendar days on the base scale on the back side of the slide rule body. , are provided at equal intervals, and East longitude coordinate scales are provided at equal intervals at positions corresponding to the ends of the calendar date scales, and furthermore, a night-only scale is provided on the middle scale that slides along the longitudinal direction of the base scale. A sidereal time slide rule consisting of a solar time scale and a sidereal time scale divided into half days, each with equally spaced scales.