Geographic Longitude Rules

1. All longitudes are counted in the direction from the initial meridian to the meridian of 180 °
2. Points located to the west of the initial meridian have a western longitude, which is indicated as follows: XX ° C. d
3. If the points are located east of the initial meridian, then their geographical longitude is considered eastern and is designated as follows: XX ° c. d
4. The initial meridian has a longitude of 0 ° d., And the opposite meridian and lying with it in the same plane has a longitude of 180 ° d
5. The semicircle of any meridian consists of points. Their geographical longitude by value can not be less than 0 ° and more than 180 °

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