Andrew Planck

Astronomer, Teacher, Musician

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Lunar Days in May

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

Copernicus – The Monarch of the Moon

Copernicus – The Monarch of the Moon

The week of May 19-25 takes us from Day 22 to Day 28. This week we will highlight the moon crater Copernicus, the Monarch of the Moon, visible on Tuesday night. Copernicus: [NW/J7; L=20°W] Magnificent Copernicus has been justifiably dubbed

Andrew Planck May 19, 2025May 16, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in May, Moon craters No Comments Read more

Moon Craters Aristillus and Autolycus

Moon Craters Aristillus and Autolycus

The week of May 12-18 takes us from Day 15 to Day 23. This week we will highlight the moon craters Aristillus & Autolycus, visible on Sunday night. Aristillus/Autolycus: [NE/F10; L=1°E] Aristillus is a well-defined complex crater, 34 miles in

Andrew Planck May 12, 2025May 9, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in May, Moon craters No Comments Read more

Tycho – One of the Moon’s Showpieces

Tycho – One of the Moon’s Showpieces

The week of May 5-11 takes us from Day 8 to Day 14. This week we will highlight the moon crater Tycho, visible on Tuesday night. Tycho:1 [SW/P8; L=11°W] Tycho is one of the Moon’s showpieces, both on Day 8

Andrew Planck May 5, 2025April 30, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in May, Moon craters No Comments Read more

Rima Ariadaeus is a Classic Example of a Graben on the Moon

Rima Ariadaeus is a Classic Example of a Graben on the Moon

The week of May 27 – June 2 takes us from Day 20 to Day 26. This week we will highlight Rima Ariadaeus, viewable close to the terminator on Sunday evening, June 2, Day 26 and located in the NE

Andrew Planck May 27, 2024May 24, 2024 Lunar Days in May, Rilles on the Moon No Comments Read more

Subsidence on the Moon – Moon Crater Fracastorius

Subsidence on the Moon – Moon Crater Fracastorius

The week of May 20-26 takes us from Day 13 to Day 18. This week we will highlight the moon crater Fracastorius, viewable on Saturday evening, May 25, Day 18 and located in the SE quadrant of the Field Map

Andrew Planck May 20, 2024May 17, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in May, Moon craters, Subsidence on the Moon, Uncategorized No Comments Read more

Albategnius: An 85-Mile Complex Moon Crater

Albategnius: An 85-Mile Complex Moon Crater

The week of May 13-19 takes us from Day 6 to Day 11. This week we will highlight the moon crater Albategnius, viewable on Wednesday evening, May 15, Day 8, and located in the SE quadrant of the Field Map

Andrew Planck May 13, 2024May 8, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in May No Comments Read more

Two Faults on the Moon Paralleled by a Nearby Rille

Two Faults on the Moon Paralleled by a Nearby Rille

The week of May 6-12 takes us from Day 28 to Day 5. This week we will highlight Rupes Cauchy, viewable on Sunday evening, May12, Day 5, and located in the NE quadrant of the Field Map at J13. Rupes

Andrew Planck May 6, 2024May 3, 2024 Dates to Observe Objects on the Moon, Faults on the Moon, Lunar Days in May No Comments Read more

Moon Crater Hippalus: Finest Examples of Arcuate Rilles

Moon Crater Hippalus: Finest Examples of Arcuate Rilles

The week of May 29 – June 4 takes us from Day 10 to Day 16. This week we will highlight the Hippalus rilles, viewable on Tuesday evening. Rimae Hippalus: [SW/M6; L=29°W] On the east shore of Mare Humorum you

Andrew Planck May 29, 2023May 20, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in May, Rilles on the Moon 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
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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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