Andrew Planck

Astronomer, Teacher, Musician

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Saturn

Clavius – Moon Crater Strewn with Craterlets

Clavius – Moon Crater Strewn with Craterlets

The week of June 16-22 takes us from Day 21 to Day 27. This week we will highlight the moon crater Clavius, visible on Tuesday night close to the terminator. Clavius: [SW/Q8] Sunset over Clavius is something that you don’t

Andrew Planck June 16, 2025June 14, 2025 Celestial Events, chain of moon craters, Craters on the Moon, Night Sky Observations, Saturn 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

Altai Scarp (Rupes Altai) – How Shock Waves from a Major Impact can Compress the Surrounding Terrain

Altai Scarp (Rupes Altai) – How Shock Waves from a Major Impact can Compress the Surrounding Terrain

The week of January 13-19 takes us from Day 14 to Day 20. This week we will highlight Rupes Altai, visible on Saturday night. Altai Scarp (Rupes Altai): [SE/M12] Viewable even through small telescopes, the Altai Scarp is a spectacular

Andrew Planck January 13, 2025January 10, 2025 Lunar Days in January, Mountain Ranges on the Moon No Comments Read more

Trio of Moon Craters, Theophilus, Cyrillus,and Catharina

Trio of Moon Craters, Theophilus, Cyrillus,and Catharina

The week of December 30-Jan 5 takes us from Lunar Day 0 to Day 6. This week we will highlight the trio of moon craters, Theophilus, Cyrillus,and Catharina, visible on Saturday night. Theophilus, Cyrillus, Catharina: [Repeated from Day 5–SE/L12; L=24°E]

Andrew Planck December 30, 2024December 6, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in December, Moon craters No Comments Read more

Moon Crater Rima Hyginus – Line of Linked Craters

Moon Crater Rima Hyginus – Line of Linked Craters

The week of December 2 – December 8 takes us from Lunar Day 2 to Day 8. This week we will highlight Rima Hyginus, visible on Saturday night. Rima Hyginus: [NE/J10; L=8°E] At the west end of the Ariadaeus rille,

Andrew Planck December 2, 2024November 21, 2024 chain of moon craters, Craters on the Moon, Lunar Days in December, Moon craters, Rilles on the Moon No Comments Read more

Janssen – Ancient Impact Moon Crater

Janssen – Ancient Impact Moon Crater

The week of November 4-10 takes us from Lunar Day 3 to Day 9 This week we will highlight the moon crater Janssen, visible on Tuesday night. Janssen is an ancient impact moon crater located in the highland region near

Andrew Planck November 4, 2024October 25, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in November No Comments Read more

Vallis Rheita on the Moon

Vallis Rheita on the Moon

The week of August 19-25 takes us from Day 15 to Day 21. This week we will highlight Vallis Rheita, located in the SE quadrant of the Field Map at N14 and viewable on Wednesday night. Vallis Rheita: [SE/N14; L=52°E]

Andrew Planck August 19, 2024August 16, 2024 Lunar Days in August, Valleys on the Moon No Comments Read more

Rupes Recta – The Straight Wall on the Moon

Rupes Recta – The Straight Wall on the Moon

The week of April 29 – May 5 takes us from Day 20 to Day 27. This week we will highlight Rupes Recta, the Straight Wall, viewable early Wednesday morning, Day 22, and located in the SW quadrant of the

Andrew Planck April 29, 2024April 26, 2024 Dates to Observe Objects on the Moon, Faults on the Moon, Lunar Days in April No Comments Read more

Multi-Ring Basin on the Moon – Mare Nectaris

Multi-Ring Basin on the Moon – Mare Nectaris

The week of August 28 – September 3 takes us from Day 13 to Day 20. This week we will highlight Mare Nectaris on the moon, which is viewable Sunday night in the SE quadrant of Lunar Map at L13.

Andrew Planck August 28, 2023August 25, 2023 Dates to Observe Objects on the Moon, Lunar Days in August, Multi-ring basin on the moon No Comments Read more

Mons Piton – Isolated Mountain on the Moon

Mons Piton – Isolated Mountain on the Moon

The week of March 13-19 takes us from Day 21 to Day 28. This week we will highlight Mons Piton on the moon, located in the NW quadrant of the Field Map and viewable early Tuesday morning. Mons Piton: [NE/E9;

Andrew Planck March 13, 2023March 11, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in March, 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)
  • 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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