Andrew Planck

Astronomer, Teacher, Musician

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Moon Crater Aristoteles, Close to the Terminator

Moon Crater Aristoteles, Close to the Terminator

The week of November 10 – November 16 takes us from Day 20 to Day 26. This week we will highlight the moon crater Aristoteles, visible on Tuesday night close to the terminator. Aristoteles: [NE/D11; L=17°E] Close to the terminator

Andrew Planck November 10, 2025November 4, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in November, Moon craters, Unusual Features on the Moon No Comments Read more

Crater Bullialdus on the Moon

Crater Bullialdus on the Moon

The week of March 18-24 takes us from Day 9 to Full Moon. This week we will highlight the moon crater Bullialdus, located at SW/M7 on the Lunar Map. Bullialdus: [SW/M7; L=22°W] If you recall what Tycho looked like last

Andrew Planck March 18, 2024March 16, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in March No Comments Read more

Eye-Catching Pair of Moon Craters – Aristoteles and Eudoxus

Eye-Catching Pair of Moon Craters – Aristoteles and Eudoxus

The week of December 25-31 takes us from Day 14 to Day 20. This week we will highlight the moon craters Aristoteles and Julius Caesar, viewable on Sunday night and found in the NE quadrant of the Field Map. Aristoteles:

Andrew Planck December 25, 2023December 17, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in December, Moon craters No Comments Read more

Bullialdus: The Most Conspicuous Moon Crater on Mare Nubium

Bullialdus: The Most Conspicuous Moon Crater on Mare Nubium

The week of February 27 – March 5 takes us from Lunar Day 8 to Day 14. This week we will highlight the moon crater Bullialdus, located in the SW quadrant of the Field Map and viewable on Wednesday night.

Andrew Planck February 27, 2023February 26, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in February No Comments Read more

Moon Craters Aristoteles and Julius Caesar

Moon Craters Aristoteles and Julius Caesar

The week of November 28 – December 4 takes us from Lunar Day 6 to Day 12. This week we will highlight the moon craters Aristoteles & Julius Caesar, found in the NE quadrant of the Field Map. Aristoteles: [NE/D11;

Andrew Planck November 28, 2022November 27, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in December, Lunar Days in November No Comments Read more

Moon Crater Archimedes and Story Behind “Eureka, I have found it!”

Moon Crater Archimedes and Story Behind “Eureka, I have found it!”

The week of October 25-31 takes us from Day 20 to 25. This week we will highlight the moon crater Archimedes, viewable after midnight on Wednesday, Day 22. Archimedes1: [NW/G9; L=4°W] This is a prominent 50-mile crater with terraces and

Andrew Planck October 25, 2021October 25, 2021 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in October, Lunar Observers No Comments Read more

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It is highly recommended that you get a copy of Sky and Telescope's Field Map of the Moon, the very finest Moon map available for use at the telescope. It is available for $10.95 at www.skyandtelescope.com and on Amazon. All features mentioned in this blog will be keyed to the grid on the Field Map and will look like this: Plato: [NW/D9]

Credits: Courtesy of Gray Photography of Corpus Christi, Texas Lunar photos: NASA / USGS / BMDO / LROC / ASU / DLR / LOLA / Moon Globe. Used by permission

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Andrew Planck
Andrew Planck
Author and Astronomer Andrew Planck shepherds you to the moon and its mysteries of intrigue and surprise. Learn about the moon’s most fascinating objects, understand how the moon was formed and the names of many of the craters … and why they honor individuals who have changed the course of history.
Andrew Planck
Latest posts by Andrew Planck (see all)
  • Moon Crater Cassini – Created on Imbrium floor Before Lavas Started to Flow - January 19, 2026
  • Bailly – Largest Crater on Our Side of the Moon - January 12, 2026
  • Longomontanus: Exception to the Rule About Moon Crater Age - January 5, 2026
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