Andrew Planck

Astronomer, Teacher, Musician

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Bailly – Largest Crater on Our Side of the Moon

Bailly – Largest Crater on Our Side of the Moon

The week of January 12-18 takes us from Day 24 to Day 1. This week we will highlight the moon crater Bailly, visible on Tuesday night close to the terminator. Bailly: [SW/R3; L=69°W] To observe this moon crater, it is

Andrew Planck January 12, 2026January 9, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in January, Moon craters No Comments Read more

Longomontanus: Exception to the Rule About Moon Crater Age

Longomontanus: Exception to the Rule About Moon Crater Age

The week of January 5-11 takes us from Day 17 to Day 23. This week we will highlight the moon crater Longomontanus. Longomontanus: [SW/P7; L=22°W] Take a look at moon crater Longomontanus and before reading further, decide if something seems

Andrew Planck January 5, 2026December 9, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in January, Moon craters No Comments Read more

Humboldt: Moon Crater with Cluster of Central Peaks

Humboldt: Moon Crater with Cluster of Central Peaks

The week of December 1-7 takes us from Day 12 to Day 18. This week we will highlight the moon crater Humboldt, visible on Thursday night close to the terminator. Humboldt: [SE/M18; L=81°E] This moon crater is best viewed when

Andrew Planck December 1, 2025November 24, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in November, Moon craters No Comments Read more

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

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

Reiner Gamma and Lunar Swirls on the Moon

Reiner Gamma and Lunar Swirls on the Moon

The week of August 18-24 takes us from Day 25 to Day 2. This week we will highlight the Reiner Gamma, visible on Tuesday & Wednesday nights close to the terminator. Reiner Gamma: [NW/J4; L=59°W] Lunar swirls are absolutely flat

Andrew Planck August 18, 2025August 14, 2025 Lunar Days in August, Lunar Swirls, Unusual Features on the Moon No Comments Read more

Moon Crater Humboldt

Moon Crater Humboldt

The week of July 21-27 takes us from Day 27 to Day 3. This week we will highlight the moon crater Humboldt, visible on Saturday night close to the terminator. Humboldt:1 [SE/M18] This moon crater is best viewed when there

Andrew Planck July 21, 2025July 17, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in July, Moon craters No Comments Read more

A Graben on the Moon: Rima Ariadaeus

A Graben on the Moon: Rima Ariadaeus

The week of April 28-May 4 takes us from New Moon to Day 7. This week we will highlight Rima Ariadaeus, visible on Sunday night. Rima Ariadaeus: [Repeated from Day 6–NE/J11; L=14°E] The best place to see rilles on the

Andrew Planck April 28, 2025April 5, 2025 Dates to Observe Objects on the Moon, Lunar Days in April, Rilles on the Moon No Comments Read more

Moon Crater Taruntius

Moon Crater Taruntius

The week of March 31-April 6 takes us from Lunar Day 3 to Day 9. This week we will highlight the moon crater Taruntius, visible on Tuesday night close to the terminator. Taruntius: [NE/J14; L=47°E] Located on the north shore

Andrew Planck March 31, 2025March 27, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Floor Fractured Moon Craters, Lunar Days in April, Lunar Days in March, Simple Moon Craters No Comments Read more

Altai Scarp (Rupes Altai) – How Shock Waves from a Major Impact can Compress the Surrounding Terrain

Altai Scarp (Rupes Altai) – How Shock Waves from a Major Impact can Compress the Surrounding Terrain

The week of January 13-19 takes us from Day 14 to Day 20. This week we will highlight Rupes Altai, visible on Saturday night. Altai Scarp (Rupes Altai): [SE/M12] Viewable even through small telescopes, the Altai Scarp is a spectacular

Andrew Planck January 13, 2025January 10, 2025 Lunar Days in January, Mountain Ranges 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 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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