Horrocks is a

lunar Lunar most commonly means "of or relating to the Moon". Lunar may also refer to: Arts and entertainment * ''Lunar'' (series), a series of video games * "Lunar" (song), by David Guetta * "Lunar", a song by Priestess from the 2009 album ''Prior t ...

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 ...

located entirely within the eroded northeast rim of the much larger walled plain

Hipparchus Hipparchus (; , ; BC) was a Ancient Greek astronomy, Greek astronomer, geographer, and mathematician. He is considered the founder of trigonometry, but is most famous for his incidental discovery of the precession of the equinoxes. Hippar ...

. Its diameter is . It was named after the 17th-century

English English usually refers to: * English language * English people English may also refer to: Culture, language and peoples * ''English'', an adjective for something of, from, or related to England * ''English'', an Amish ter ...

astronomer

Jeremiah Horrocks Jeremiah Horrocks (16183 January 1641), sometimes given as Jeremiah Horrox (the Latinised version that he used on the Emmanuel College register and in his Latin manuscripts), – See footnote 1 was an English astronomer. He was the first perso ...

. To the south of Horrocks are the craters

Halley Halley may refer to: Science * Halley's Comet, officially designated 1P/Halley, a comet that becomes visible from Earth every 75-76 years * Halley (lunar crater), a lunar crater named after Edmond Halley * Halley (Martian crater), a Martian cra ...

and

Hind A hind is a female deer, especially a red deer. Places * Hind (Sasanian province) (262-484) * Al-Hind, a Persian and Arabic name for the Indian subcontinent * Islamic State – Hind Province, claimed province of the IS in India * Hind (cra ...

, Rhaeticus is to the north, and Pickering to the northeast. Gyldén and Saunder lie to the west and east, respectively. The rim of Horrocks is somewhat irregular and

polygon In geometry, a polygon () is a plane figure made up of line segments connected to form a closed polygonal chain. The segments of a closed polygonal chain are called its '' edges'' or ''sides''. The points where two edges meet are the polygon ...

al, particularly with an outward protrusion on the eastern rim. It has a small outer ridge. The inner wall is slumped, particularly along the northwest where it forms a heap of talus. The interior floor is uneven, and it has a central mountain and hills. The crater is approximately in diameter and deep. It is from the

Eratosthenian The Eratosthenian period in the lunar geologic timescale runs from 3,200 million years ago to 1,100 million years ago. It is named after the crater Eratosthenes, which displays characteristics typical of craters of this age, including a surface ...

period, which lasted from 3.2 to 1.1 billion years ago.''Autostar Suite Astronomer Edition''. CD-ROM. Meade, April 2006.

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 Horrocks.

References

External links

Horrocks at The Moon Wiki
* * * {{cite web, last = Wood , first = Chuck , date = April 30, 2009 , url = http://lpod.wikispaces.com/April+30%2C+2009 , title = A Little Bit About a Normal Crater (written as A Little Bit about a Normal Crater) , publisher = Lunar Photo of the Day Impact craters on the Moon Eratosthenian