Andrew Planck

Astronomer, Teacher, Musician

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Rima Hyginus: A Line of Linked Moon Craters

Rima Hyginus: A Line of Linked Moon Craters

The week of September 4 – September 10 takes us from Day 20 to Day 26. This week we will highlight Rima Hyginus, viewable on Tuesday before midnight. Rima Hyginus: [NE/J10; L=8°E] At the west end of the Ariadaeus rille,

Andrew Planck September 4, 2023August 31, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in September, Rilles on the Moon No Comments Read more

Moon Craters in Fra Mauro Region Critical to Understanding Important Process That Shaped the Moon

Moon Craters in Fra Mauro Region Critical to Understanding Important Process That Shaped the Moon

The week of July 10 – July 16 takes us from Day 22 to Day 29. This week we will highlight moon craters in the Fra Mauro region, viewable before sunrise on Tuesday. Fra Mauro region: [SW/K8; L=17°W] Moon craters

Andrew Planck July 10, 2023July 6, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in July, Moon craters 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

One of the Moon’s Best Examples of Subsidence: Moon Crater Fracastorius

One of the Moon’s Best Examples of Subsidence: Moon Crater Fracastorius

The week of March 20-26 takes us from Day 29 to Day 6 This week we will highlight the moon crater Fracastorius, located in the SE quadrant of the Field Map and viewable on Sunday night. Fracastorius: [SE/M13; L=33°E] Located

Andrew Planck March 20, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in March, Rilles on the Moon 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

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 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

Apennine Mountain Range and Rupes Recta, the Straight Wall, on the Moon

Apennine Mountain Range and Rupes Recta, the Straight Wall, on the Moon

The week of October 31 – November 6 takes us from Lunar Day 7 to Day 13. This week we will highlight the Apennine Mountain range, located on the Field Map at [NW/G9] and viewable Tuesday evening, and Rupes Recta,

Andrew Planck October 31, 2022October 28, 2022 Dates to Observe Objects on the Moon, Faults on the Moon, Lunar Days in November, Lunar Days in October 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)
  • Clavius – Moon Crater Strewn with Craterlets - June 16, 2025
  • Furnerius – Southernmost Moon Crater That Makes Up the Great Eastern Chain - June 9, 2025
  • Albategnius – 85 mile Complex Moon Crater - June 2, 2025
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