Aristarchus

The query contains two distinct subjects: Aristarchus of Samos, an ancient Greek astronomer, and Aristarchus, a lunar crater. The provided search results offer information on both.

Aristarchus of Samos

Aristarchus of Samos (c. 310–c. 230 BCE) was a Greek astronomer who proposed that the Earth rotates on its axis and revolves around the Sun. This heliocentric view was controversial and led to accusations of impiety. His work on this theory is not extant, but it is known through references by other ancient scholars. Aristarchus's only surviving work, On the Sizes and Distances of the Sun and Moon, used geometric methods to estimate the relative sizes and distances of these celestial bodies, though his numerical results were not entirely accurate due to measurement limitations of his time. His ideas influenced later astronomers like Nicolaus Copernicus.1

Aristarchus (Lunar Crater)

Aristarchus is a prominent lunar crater, approximately 40 km (25 miles) in diameter and 4 km (2.5 miles) deep. It is characterized by slumping terraces on its walls and a central peak. This impact crater is located on an elevated surface surrounded by lava flows. The region around Aristarchus exhibits unusual features, including sinuous rilles, which are winding channels whose origins are not fully understood.2