Andrew Planck

Astronomer, Teacher, Musician

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Small Pair of Moon Craters – Messier and Messier A

Small Pair of Moon Craters – Messier and Messier A

The week of May 26 – June 1 takes us from Day 29 to Day 6. This week we will highlight the moon crater Messier, visible on Friday and Saturday nights. Messier: [SE/K14; L=48°E] One of my favorite objects on

Andrew Planck May 26, 2025May 23, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in May, Moon craters No Comments Read more

Crater Bullialdus on the Moon

Crater Bullialdus on the Moon

The week of March 18-24 takes us from Day 9 to Full Moon. This week we will highlight the moon crater Bullialdus, located at SW/M7 on the Lunar Map. Bullialdus: [SW/M7; L=22°W] If you recall what Tycho looked like last

Andrew Planck March 18, 2024March 16, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in March 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

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

Messier and Messier A: Small Pair of Moon Craters on the Sea of Fertility

Messier and Messier A: Small Pair of Moon Craters on the Sea of Fertility

The week of January 31 – February 6 takes us from Day 29 to Day 6. This week we will highlight the moon craters Messier and Messier A, viewable on Friday night. Messier1: [SE/K14] One of my favorite objects on

Andrew Planck January 31, 2022January 30, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in February, Lunar Days in January No Comments Read more

Moon Craters Maginus and Catena Davy

Moon Craters Maginus and Catena Davy

The week of November 18-24 takes us from Day 21 to Day 27. This week we will highlight the crater Maginus and Catena Davy viewable after midnight on Tuesday. Maginus: [SW/Q9; L=6°W] Located at the eastern tip of the diamond

Andrew Planck November 18, 2019November 18, 2019 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in November, Unusual Features 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 Janssen Located 85 miles Southwest of the Rheita Valley - July 7, 2025
  • Albategnius – How to Observe This Stunning Moon Crater Near the Terminator - June 30, 2025
  • Vallis Rheita: The Moon’s Longest Valley and a Stunning Lunar Observation Target This Week - June 23, 2025
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