JPH01102796U

JPH01102796U -

Info

Publication number: JPH01102796U
Application number: JP19878587U
Authority: JP
Priority date: 1987-12-25
Filing date: 1987-12-25
Publication date: 1989-07-11

Description

[Brief explanation of the drawing]

第１図は中央で回転する円盤を示したもので
ある。この円盤は中心点を北極とし地球をその
北極の真上から見た形式をとつているが赤道の
南側にある都市もその経度に従つて記入してある
。また日付変更線をはつきりと示す。第２図は中央で回転する円盤の外側にある基
盤を示したものである。この基盤にはちようど
円盤に接するところに左回りに中心角１５度の間
隔で０時から２３時までの時刻を固定しておく。
なおこの基盤上の時刻表示のうち６時から１
８時までの範囲は日中となるのでその付近を明
色で示し１８時から６時までは夜となるので暗
色とする。第３図は第１図の円盤と第２図の基盤とを組
み合わせて実際に利用した場合の効果を示したも
のである。円盤上の日付変更線が基盤上の０時の
位置を過ぎると基盤上の０時の位置と円盤の中
心を結ぶ線および日付変更線の二つの線で囲まれ
た範囲は他の部分の日付に対して翌日の日付と
なる。この翌日となる範囲を模様や色などの分か
りやすい方法で前日となる部分と区別してあら
わす。下方に日付を表示する凡例を設けた。この
凡例の表示も勿論地球円盤の回転と共に移り
変わつて行くように別途工夫する。 Figure 1 shows a disk rotating in the center. The center of this disk is the North Pole, and the Earth is viewed from directly above the North Pole, but cities located south of the equator are also marked according to their longitudes. It also clearly shows the international date line. Figure 2 shows the base on the outside of the centrally rotating disk. On this base, the time from 0:00 to 23:00 is fixed counterclockwise at intervals of 15 degrees at the central angle where it touches the disk.
Of the time displays on this board, from 6 o'clock to 1
The area from 8 o'clock to 8 o'clock is daytime, so the area around it is shown in light colors, and from 18 o'clock to 6 o'clock it is night, so it is shown in dark colors. FIG. 3 shows the effect when the disk shown in FIG. 1 and the base shown in FIG. 2 are actually used in combination. When the date line on the disc passes the 0 o'clock position on the base, the range surrounded by the line connecting the 0 o'clock position on the base and the center of the disc, and the date line, is the date of other parts. becomes the next day's date. The next day's range is represented using easy-to-understand methods such as patterns and colors to distinguish it from the previous day's range. A legend is provided to display the date at the bottom. Of course, the display of this legend will also be devised separately so that it changes as the Earth's disk rotates.

Claims

[Claim for Utility Model Registration] A rotating disc world watch that allows you to grasp the date, day/night distinction, and time relationships of each location in the world at a glance. A clock that rotates eastward around the North Pole on a counterclockwise 24-hour clock that surrounds the Earth as a disk viewed from directly above the North Pole. When rotated, the time in each city can be read using the longitude lines on the Earth's disk. When the international date line passes the 0 o'clock position on the base, the area surrounded by the line connecting 0 o'clock and the North Pole and the international date line becomes the next day's date. This will be displayed on the Earth's disk in an appropriate manner, such as by using different patterns or colors, and the two different dates will be represented in easy-to-understand legends on the base, etc.