Andrew Planck

Astronomer, Teacher, Musician

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Author: Andrew Planck

Moon Crater Fra Mauro and Apollo 14 Astronauts

Moon Crater Fra Mauro and Apollo 14 Astronauts

The week of September 29 – October 5 takes us from Day 8 to Day 14. This week we will highlight the moon crater Fra Mauro, visible on Tuesday night close to the terminator. Fra Mauro region: [SW/K8; L=17°W] Moon

Andrew Planck September 29, 2025September 27, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in October, Lunar Observers, Moon craters, Rilles on the Moon, Simple Moon Craters No Comments Read more

Moon Crater Humboldt – Best Viewed with Pronounced Libration

Moon Crater Humboldt – Best Viewed with Pronounced Libration

The week of September 22-28 takes us from Day 1 to Day 7. This week we will highlight the moon crater Humboldt, visible on Tuesday night close to the eastern edge. Humboldt1: [SE/M18] This moon crater is best viewed when

Andrew Planck September 22, 2025September 17, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in September 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

Theophilus – One of a Trio of Imposing Moon Craters

Theophilus – One of a Trio of Imposing Moon Craters

The week of September 8-14 takes us from Day 16 to Day 23. This week we will highlight the moon crater Theophilus, visible on Thursday night. Theophilus, Cyrillus, Catharina: [Repeated from Day 5–SE/L12; L=24°E] This is the most imposing trio

Andrew Planck September 8, 2025September 3, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in September No Comments Read more

Cleomedes: First Significant Moon Crater North of Mare Crisium

Cleomedes: First Significant Moon Crater North of Mare Crisium

The week of September 1-7 takes us from Day 10 to Day 16. This week we will highlight the moon crater Cleomedes, visible on Sunday night. Cleomedes: [NE/G15; L=56°E] Cleomedes is the first significant moon crater just north of Mare

Andrew Planck September 1, 2025August 28, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in September, Moon craters, Rilles on the Moon No Comments Read more

Apennine Mountain Range on the Moon – Most Spectacular Feature

Apennine Mountain Range on the Moon – Most Spectacular Feature

The week of August 25-31 takes us from Day 25 to Day 9. This week we will highlight Montes Apenninus, visible on Sunday night close to the terminator. Montes Apenninus: [NW/H9-G10; L=4°W] The Apennine Mountain Range is the most spectacular

Andrew Planck August 25, 2025August 22, 2025 Lunar Days in August, 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 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

Schickard: Moon Crater Floor with Stripes

Schickard: Moon Crater Floor with Stripes

The week of August 4-10 takes us from Day 11 to Day 17. This week we will highlight the moon crater Schickard, visible on Wednesday night close to the terminator. Schickard: [SW/P4; L=55°W] When you look at moon crater Schickard,

Andrew Planck August 4, 2025July 30, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in August, Moon craters No Comments Read more

The Longest Distinct Valley on the Moon – Rheita Valley

The Longest Distinct Valley on the Moon – Rheita Valley

The week of July 28 – August 3 takes us from Day 4 to Day 10. This week we will highlight the Rheita Valley on the moon, visible on Tuesday night close to the terminator. Vallis Rheita: [SE/N14; L=52°E] At

Andrew Planck July 28, 2025July 28, 2025 Lunar Days in August, Lunar Days in July, Moon craters, Valleys 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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