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Sunset drama.

By Richard Hill  |  24 Oct 2019

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This entry is part 16 of 81 in the series Lunarcy

I don’t usually get to see sunset terminators because of the mountains and trees to my east so this night was a treat because the moon was at such a high declination that it was overhead. A number of my favorites were in one field of view here. The large crater at the top is Aristoteles (90 km dia.) with Mitchell (31 km) taking a bite out of its southeast (lower right) wall. Due south of this pair is Eudoxus (70 km) and east of that, deep in shadow, is Burg (41 km) in the center of the hexagonal Lacus Mortis. All three of these large craters are recent by lunar standards. The latter two are Copernican age of 1.1 billion years or less while Aristoteles is a older, Eratosthean age between 1.1-3.2 billion years. But if you want something really old, Lacus Mortis, is Pre-Imbrian age may be as much as 4.5 billion years old, that’s 18 rotations of our galaxy ago!!

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