Andrew Planck

Astronomer, Teacher, Musician

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Mars

Largest and Most Conspicuous Moon Crater – Maurolycus

Largest and Most Conspicuous Moon Crater – Maurolycus

The week of October 21-27 takes us from Lunar Day 19 to Day 25. This week we will highlight the moon crater Maurolycus, visible on Tuesday night. Maurolycus: [SE/P11; L=14°E] Let us venture briefly into a region where angels fear

Andrew Planck October 21, 2024October 17, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in October, Moon craters No Comments Read more

Apennine Mountain Range on the Moon

Apennine Mountain Range on the Moon

The week of September 23-29 takes us from Day 20 to Day 26. This week we will highlight the Apennine Mountains, viewable on Tuesday night, located in the NW quadrant of the Field Map at G10. Montes Apenninus: [Repeated from

Andrew Planck September 23, 2024September 15, 2024 Lunar Days in September, Mountain Ranges on the Moon, Uncategorized No Comments Read more

Sinus Iridum – the Bay of Rainbows – Crater on the Moon

Sinus Iridum – the Bay of Rainbows – Crater on the Moon

The week of August 12-18 takes us from Day 8 to Day 15 This week we will highlight Sinus Iridum, located in the NW quadrant of the Field Map at E6 and viewable on Wednesday night. Sinus Iridum: [NW/E6; L=32°W]

Andrew Planck August 12, 2024August 9, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in August, Subsidence on the Moon, Wrinkle Ridge on the moon No Comments Read more

Series of Rilles on the Moon: Rimae Sirsalis

Series of Rilles on the Moon: Rimae Sirsalis

The week of July 29 – August 4 takes us from Day 24 to New Moon. This week we will highlight a series of rilles called Rimae Sirsalis, located in the SW quadrant of the Field Map and viewable on

Andrew Planck July 29, 2024July 30, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in August, Lunar Days in July, Rilles on the Moon, Uncategorized No Comments Read more

Crater Longomontanus on the Moon

Crater Longomontanus on the Moon

The week of April 1-7 takes us from Day 22 to 28. This week we will highlight the moon crater Longomontanus, viewable on Tuesday morning before sunrise. Longomontanus: [SW/P7; L=22°W] Take a look at Longomontanus and before reading further, decide

Andrew Planck April 1, 2024March 16, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April No Comments Read more

Rima Hyginus (Hyginus Rille) on the Moon

Rima Hyginus (Hyginus Rille) on the Moon

The week of November 27 – December 3 takes us from Day 16 to Day 21. This week we will highlight Rima Hyginus (the Hyginus rille) on the moon, viewable on Saturday night around 11:00 and located in the NE

Andrew Planck November 27, 2023November 6, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in November, Mars, 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

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

Sulpicius Gallus Rilles on the Moon

Sulpicius Gallus Rilles on the Moon

The week of May 22-28 takes us from Day 3 to Day 9. This week we will highlight the Sulpicius Gallus rilles on the moon, viewable on Friday evening. Sulpicius Gallus Rilles: [NE/G10-11; L=10°E] These rilles, located on the south-western

Andrew Planck May 22, 2023May 17, 2023 Lunar Days in May, Mars, Rilles on the Moon, Venus No Comments Read more

Apennine Mountain Range – Most Spectacular Feature on the Moon

Apennine Mountain Range – Most Spectacular Feature on the Moon

The week of April 24-30 takes us from Day 5 to Day 10. This week we will highlight Montes Apenninus, the Apennine Mountains, viewable on Thursday and Friday nights. Montes Apenninus: [NW/H9-G10; L=4°W] The Apennine Mountain Range is the most

Andrew Planck April 24, 2023April 22, 2023 Dates to Observe Objects on the Moon, Lunar Days in April, 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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