Eratosthenes crater and Sinus Aestuum

Photographer: Victor Lupu
Optics: Celestron C8-Newtonian telescope, plossl 20mm, 2x Barlow
Mount: CG5 (EQ5)
Device: Sony CX105
Filter: No
Date: 11/05/2011
Location: Baia Mare, Romania
Processing: Sony Vegas 10 video captures

Eratosthenes (58 km), is a lunar crater 3.6 kilometers deep, which is at the limit of Mare Imbrium and Sinus Aestuum. This crater forms the western mountains of Montes Apenninus.Crater has well-defined circular rim, terraced inner walls, mountain peaks in the center , an irregular floor and an exterior wave caused by the impact. It does not have a ray system, but it is touched by the rays of Copernicus crater to the southwest.
Eratosthenian period in terms of lunar geological time, is named after this crater.Crater is believed to date about 3.2 billion years ago, at the beginning of this period of time.

 Eratosthenes of Cyrene bears the name of the crater (Greek: Ἐρατοσθένης, c. 276 BC - c. 195 BC), who was a greek mathematician, poet, athlet, geographer, astronomer, and a musical theorist.He was the first person who used the word "geography" and invented the discipline in geography as we understand it. He invented the system of latitude and longitude.
He was the first person who calculated the circumference of the Earth and the first calculate the tilt axis of the earth (with remarkable accuracy). Eratosthenes also calculated the precise distance from Earth to the Sun and created a geographical world map based on the available knowledge of his time.

Sinus Aestuum (Latin:"Bay of Billows") is an extension of the northeast to Mare Insularum and has a diameter of 290 km.
Sinus Aestuum is almost with no albedo on surface or basalt lava. It is marked by several small impacts, and some rilles.At the east border is an irregular area that divides the bay from Mare Vaporum at east. To the north are Montes Apenninus and the crater Eratosthenes. Along the west side is the flooded crater Stadius (69 km),and Mare Insularum at southwest.

Posted in: Craters,Craters of the center,Craters-Eratosthenes and Sinus Aestuum