View Single Post
Old 06-04-2012, 11:39 PM   #90
Senior Member
Join Date: Apr 2008
Location: Inactive
Posts: 36,483
Likes: 237 (190 Posts)
Lightbulb The Prime Meridian of the Moon

A prime meridian is a meridian, i.e. a line of longitude, at which longitude is defined to be 0°...A prime meridian and its opposite in a 360°-system, the 180th meridian (at 180° longitude), form a great circle....If one uses directions of East and West from a defined prime meridian, then this great circle divides the sphere, e.g. the Earth into the Eastern and Western Hemispheres.

The Prime Meridian of the Moon lies directly in the middle of the face of the moon visible from Earth and passes near the crater Bruce...The Prime Meridian of Mars is defined by the crater Airy-0.

Airy-0 is a crater on Mars whose location defines the position of the prime meridian of that planet. It is about 0.5 kilometres (0.31 mi) across and lies within the larger crater Airy in the region Sinus Meridiani.

Titan, like the Earth's moon, always has the same face towards Saturn, and so that face is 0 longitude.

Last edited by lightgiver; 07-04-2012 at 12:55 AM.
lightgiver is offline   Reply With Quote