#alphonsus

Arzachel crater is named after the Arabic instrument maker Abū Isḥāq Ibrāhīm ibn Yaḥyā al-Naqqāsh al-Zarqālī al-Tujibi (1029 - 1100). His Latinized name was Arzachel, meaning "the engraver." He wrote books about constructing instruments for calculating the positions of the planets.

Alphonsus crater is named after King Alfonso X of Castile (1221-1284). He was sometimes nicknamed the Astrologer for the creation of the Alfonsine tables used to compute the position of the planets.

Ptolemaeus crater is named after the Greek philosopher Claudius Ptolemy (c. 100 - 170). Among his many accomplishments is the Almagest, the earliest surviving complete book on ancient astronomy. It also provided mathematical "proof" for the geocentric nature of the universe.

Ptolemaeus crater is named after Claudius Ptolemy (c. 100-170), the Greek astronomer who wrote the Almagest that solidified the geocentric model of the universe for the next millennium.

Alphonsus crater is named after King Alfonso X of Castile (1221-1284) who sponsored the creation of the Alfonsine Tables that computed the position of the Sun, Moon, and planets relative to the stars.

Arzachel crater is named after Abū Isḥāq Ibrāhīm Yaḥyā al-Naqqāh al-Zarqālī al-Tujibi (1029-1100), an Arabic astronomer who invented two medieval instruments for navigation by the stars.