Andrew Planck

Astronomer, Teacher, Musician

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Mercury

Moon Crater Humboldt Best Viewed When Pronounced Libration

Moon Crater Humboldt Best Viewed When Pronounced Libration

The week of October 20-26 takes us from Day 1 to Day 5. This week we will highlight the moon crater Humboldt, visible on Tuesday night close to the terminator. Humboldt: [SE/M18] This moon crater is best viewed when there

Andrew Planck October 20, 2025October 12, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in October 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 Craters Cleomedes and Proclus

Moon Craters Cleomedes and Proclus

The week of March 10-16 takes us from Lunar Day 11 to Day 17. This week we will highlight the moon craters Cleomedes and Proclus visible on Sunday night close to the terminator. Cleomedes: [NE/G15] Cleomedes is the first significant

Andrew Planck March 10, 2025March 6, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in March, Moon craters No Comments Read more

Enigma of the Moon – Triesnecker Rilles

Enigma of the Moon – Triesnecker Rilles

The week of September 18-24 takes us from Day 27 to Day 10. This week we will highlight the Triesnecker Rilles, an enigma located on the moon in the NE quadrant of the Field Map at J10 and viewable on

Andrew Planck September 18, 2023September 15, 2023 Dates to Observe Objects on the Moon, Lunar Days in September, Rilles on the Moon No Comments Read more

Messier Moon Crater: Pair of Splash Rays that Resemble Tails of a Comet

Messier Moon Crater: Pair of Splash Rays that Resemble Tails of a Comet

The week of August 14-20 takes us from Day 28 to Day 4. This week we will highlight the moon crater Messier, viewable Sunday after midnight. Messier: [SE/K14; L=48°E] One of my favorite objects on the Moon is a small

Andrew Planck August 14, 2023July 30, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in August, Moon craters, Splash Rays on the Moon No Comments Read more

Rille Rima Marius on the Moon

Rille Rima Marius on the Moon

The week of June 12-18 takes us from Day 25 to Day 1. This week we will highlight the rille Rima Marius on the moon (in the NW quadrant of the Moon Map at H5) and viewable early Tuesday morning.

Andrew Planck June 12, 2023June 8, 2023 Dates to Observe Objects on the Moon, Lunar Days in June, Rilles on the Moon No Comments Read more

Moon Crater Wargentin: Unique Wrinkle Ridge Pattern

Moon Crater Wargentin: Unique Wrinkle Ridge Pattern

The week of May 15-21 takes us from Day 26 to Day 2. This week we will highlight the moon crater Wargentin, viewable early Sunday morning. Wargentin: [L=60°W] This is one of the more unusual craters on the Moon. When

Andrew Planck May 15, 2023May 10, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in May, Moon craters, Wrinkle Ridge on the moon No Comments Read more

Linné – Simple Moon Crater that Disappeared

Linné – Simple Moon Crater that Disappeared

The week of March 27-April 2 takes us from Day 29 to Day 6 This week we will highlight the moon crater Linné, located in the NE quadrant of the Field Map at G11 and viewable on Tuesday night. Linné:

Andrew Planck March 27, 2023March 27, 2023 Lunar Days in March, Moon craters, Simple Moon Craters No Comments Read more

Rupes Recta and Rupes Cauchy: Two of the Best-Known Faults on the Moon

Rupes Recta and Rupes Cauchy: Two of the Best-Known Faults on the Moon

The week of December 26 – January 1 takes us from Lunar Day 4 to Day 10. This week we will highlight the fault Rupes Cauchy located on the moon in the NE quadrant of the Field Map and viewable

Andrew Planck December 26, 2022December 20, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Faults on the Moon, Lunar Days in December, Rilles on the Moon No Comments Read more

Moon Craters Cleomedes and Proclus

Moon Craters Cleomedes and Proclus

The week of February 10-16 takes us from Lunar Day 17 (one day after full moon) to Day 22. This week we will highlight the craters Cleomedes and Proclus, viewable on Monday evening. Cleomedes: [NE/G15] Cleomedes is the first significant

Andrew Planck February 10, 2020February 11, 2020 Craters on the Moon, Lunar Days in February 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)
  • Complex Moon Crater Pythagoras - November 3, 2025
  • Theophilus, Cyrillus, Catharina Moon Craters West of Mare Nectaris - October 27, 2025
  • Moon Crater Humboldt Best Viewed When Pronounced Libration - October 20, 2025
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