Sosigenes is a lunar

impact crater An impact crater is a depression (geology), depression in the surface of a solid astronomical body formed by the hypervelocity impact event, impact of a smaller object. In contrast to volcanic craters, which result from explosion or internal c ...

on the west edge of

Mare Tranquillitatis Mare Tranquillitatis (Latin for Sea of Tranquillity or Sea of Tranquility) is a lunar mare that sits within the Tranquillitatis basin on the Moon. It contains Tranquility Base, the first location on another celestial body to be visited by huma ...

. Its diameter is 17 km. It was named after ancient Greek astronomer

Sosigenes of Alexandria Sosigenes () (fl. 1st century BC) was an Ancient Greek astronomer. According to Pliny the Elder's ''Natural History'' 18.210–212, Julius Caesar consulted him while he was designing the Julian calendar. Biography Little is known about him apa ...

. It lies to the east of the large walled plain

Julius Caesar Gaius Julius Caesar (12 or 13 July 100 BC – 15 March 44 BC) was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in Caesar's civil wa ...

. The crater rim has a high

albedo Albedo ( ; ) is the fraction of sunlight that is Diffuse reflection, diffusely reflected by a body. It is measured on a scale from 0 (corresponding to a black body that absorbs all incident radiation) to 1 (corresponding to a body that reflects ...

, making it relatively bright. It has a small central rise at the midpoint of the floor. To the east on the

mare A mare is an adult female horse or other equidae, equine. In most cases, a mare is a female horse over the age of three, and a filly is a female horse three and younger. In Thoroughbred horse racing, a mare is defined as a female horse more th ...

is a formation of parallel

rille Rille (German for 'groove') is typically used to describe any of the long, narrow depressions in the surface of the Moon that resemble channels. The Latin term is ''rima'', plural ''rimae''. Typically, a rille can be several kilometers w ...

s designated the Rimae Sosigenes. These follow a course to the north, and have a length of about 150 kilometers. The small, bowl-shaped crater Sosignes A lies across one of these rilles.

Satellite craters

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Sosigenes. Sosigenes lunar crater map

Sosigenes Irregular Mare Patch M1108117962

References

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External links

at The Moon WikiRimae Sosigenes at The Moon Wiki
- on its rille
LTO-42D4 Sulpicius Gallus
— L&PI

topographic map In modern mapping, a topographic map or topographic sheet is a type of map characterized by large- scale detail and quantitative representation of relief features, usually using contour lines (connecting points of equal elevation), but histori ...

Is the Moons' Fault
- the rille Rimae Sosigenes not mentioned in that article * - one of the craters depicts Sosigenes * {{cite web , last = Wood , first = Chuck , date = April 26, 2006 , url = http://www.lpod.org/?m=20060426 , title = Dead Romans, publisher = Lunar Photo of the Day , access-date = 2006-07-12 , url-status=dead, archive-url=https://web.archive.org/web/20110614233616/http://www.lpod.org/?m=20060426, archive-date=June 14, 2011 Impact craters on the Moon