Andrew Planck

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Copernicus

Moon Crater Kepler and Mons Delisle

Moon Crater Kepler and Mons Delisle

The week of September 15-21 takes us from Day 24 to Day 1. This week we will highlight the moon crater Kepler and Mons Delisle, visible on Tuesday night. Mons Delisle: [NW/G6] The over-imaginative among us say that if you

Andrew Planck September 15, 2025September 9, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in September, Moon craters, Mountain Ranges on the Moon No Comments Read more

Moon Crater Janssen – 85 miles Southwest of the Rheita Valley

Moon Crater Janssen – 85 miles Southwest of the Rheita Valley

The week of August 11-17 takes us from Day 18 to Day 24. This week we will highlight the moon crater Janssen visible on Tuesday night close to the terminator. Janssen: [SE/P13; L=40°E] Janssen is located 85 miles southwest of

Andrew Planck August 11, 2025August 7, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in August, Moon craters, Rilles on the Moon No Comments Read more

Copernicus – The Monarch of the Moon

Copernicus – The Monarch of the Moon

The week of May 19-25 takes us from Day 22 to Day 28. This week we will highlight the moon crater Copernicus, the Monarch of the Moon, visible on Tuesday night. Copernicus: [NW/J7; L=20°W] Magnificent Copernicus has been justifiably dubbed

Andrew Planck May 19, 2025May 16, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in May, Moon craters No Comments Read more

Pytheas Secondary Moon Craters

Pytheas Secondary Moon Craters

The week of January 20-26 takes us from Lunar Day 21 to Day 27. This week we will highlight the Pytheas secondary moon craters, visible on Tuesday night and Wednesday night close to the terminator. Pytheas secondary craters: [NW/G7-8; L=19°W]

Andrew Planck January 20, 2025January 16, 2025 Craters on the Moon, Lunar Days in January, Moon craters No Comments Read more

Pythagoras: Complex Moon Crater with Two Central Mountain Peaks

Pythagoras: Complex Moon Crater with Two Central Mountain Peaks

The week of July 1-7 takes us from Lunar Day 25 to Day 2. This week we will highlight the moon crater Pythagoras, located to the West of Mare Frigoris in the NW quadrant of the Field Map at C3.

Andrew Planck July 1, 2024July 1, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in July, Moon craters No Comments Read more

Langrenus & Vendelinus Moon Craters: First Two Segments of Great Eastern Chain

Langrenus & Vendelinus Moon Craters: First Two Segments of Great Eastern Chain

The week of February 19-25 takes us from Day 11 to 16. This week we will highlight the moon crater Langrenus, viewable on Sunday night. Langrenus & Vendelinus: [SE/K-L16; L=61°E] These craters are the first two segments of the Great

Andrew Planck February 19, 2024February 16, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in February No Comments Read more

Moon Crater Pytheas with its Secondary Craters

Moon Crater Pytheas with its Secondary Craters

The week of December 4-10 takes us from Day 22 to Day 27. This week we will highlight the moon crater Pytheas with its secondary craters, viewable on Tuesday after midnight. Pytheas secondary moon craters: [NW/G7-8; L=19°W] The best place

Andrew Planck December 4, 2023November 30, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in December, Splash Rays on the Moon, Uncategorized No Comments Read more

Eudoxus: Complex Moon Crater

Eudoxus: Complex Moon Crater

The week of July 31 – August 6 takes us from Day 14 to Day 21. This week we will highlight the moon crater Eudoxus, viewable early Sunday morning before sunrise. Eudoxus: [NE/E11; L=16°E] Both Eudoxus and Aristoteles to its

Andrew Planck July 31, 2023July 30, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in August, Lunar Days in July No Comments Read more

Moon Crater Janssen versus Copernicus, Queen of Moon Craters

Moon Crater Janssen versus Copernicus, Queen of Moon Craters

The week of September 26 – October 2 takes us from Lunar Day 1 to Day 8. This week we will highlight the crater Janssen, viewable Thursday evening very close to the terminator, and Friday evening. Janssen: [SE/P13; L=40°E] Janssen

Andrew Planck September 26, 2022September 25, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in September, Rilles on the Moon No Comments Read more

Pythagoras: Complex Moon Crater with Two Central Mountain Peaks

Pythagoras: Complex Moon Crater with Two Central Mountain Peaks

This week we will highlight the moon crater Pythagoras, viewable on Tuesday evening. Pythagoras1 : [NW/C3; L=63°W] There is only a brief period during each lunation when Pythagoras is visible. It is a complex crater with two central mountain peaks,

Andrew Planck July 11, 2022July 11, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in July, Unusual Features on the Moon 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 Maurolycus Displays a Rich Diversity of Different Types of Features - December 8, 2025
  • Humboldt: Moon Crater with Cluster of Central Peaks - December 1, 2025
  • 3 Moon Craters West of Mare Nectaris - November 24, 2025
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