Andrew Planck

Astronomer, Teacher, Musician

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Mare Nectaris

Imposing Trio of Moon Craters

Imposing Trio of Moon Craters

The week of March 17-23 takes us from Lunar Day 18 to Day 24. This week we will highlight the moon craters Theophilus, Cyrillus, and Catharina, visible on Tuesday night close to the terminator. Theophilus, Cyrillus, Catharina: [SE/L12; L=24°E] This

Andrew Planck March 17, 2025March 17, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in March, 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

Mare Nectaris – Multi-Ring Basin on the Moon

Mare Nectaris – Multi-Ring Basin on the Moon

The week of September 2-8 takes us from Day 29 to Day 6. This week we will highlight Mare Nectaris, located in the SE quadrant of the Field Map at L13 and viewable on Saturday and Sunday nights. Mare Nectaris:

Andrew Planck September 2, 2024August 22, 2024 Lunar Days in September, Moon Basin 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

West of Mare Nectaris: Moon Craters Theophilus, Cyrillus, and Catharina

West of Mare Nectaris: Moon Craters Theophilus, Cyrillus, and Catharina

The week of August 5-11 takes us from Day 1 to Day 7. This week we will highlight the trio of moon craters Theophilus, Cyrillus, and Catharina located in the SE quadrant of the Field Map at L12 and viewable

Andrew Planck August 5, 2024August 2, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in August, Moon craters No Comments Read more

Rheita Valley – Series of Interlocking Moon Craters

Rheita Valley – Series of Interlocking Moon Craters

The week of June 10-16 takes us from Day 5 to Day 10. This week we will highlight Vallis Rheita, located in the SE quadrant of the Field Map at N14 and viewable on Tuesday night. Vallis Rheita: [SE/N14; L=52°E]

Andrew Planck June 10, 2024June 7, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in June 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

Trio of Moon Craters: Theophilus, Cyrillus, Catharina

Trio of Moon Craters: Theophilus, Cyrillus, Catharina

The week of March 11-17 takes us from Day 2 to Day 8. This week we will highlight moon craters Theophilus, Cyrillus, and Catharina viewable on Saturday night. Theophilus, Cyrillus, Catharina: [Repeated from Day 5–SE/L12; L=24°E] This is the most

Andrew Planck March 11, 2024March 9, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in March No Comments Read more

Theophilus, Cyrillus, Catharina – The Most Imposing Trio of Craters on the Moon

Theophilus, Cyrillus, Catharina – The Most Imposing Trio of Craters on the Moon

The week of December 11-17 takes us from Day 29 to Day 6. This week we will highlight the moon craters Theophilus, Cyrillus, and Catherina, viewable on Sunday evening. Theophilus, Cyrillus, Catharina: [SE/L12] This is the most imposing trio of

Andrew Planck December 11, 2023December 9, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in December No Comments Read more

Rupes Altai: Scarp on the Moon

Rupes Altai: Scarp on the Moon

The week of October 2-8 takes us from Day 19 to Day 25. This week we will highlight a scarp on the moon called Rupes Altai, visible after 10:00pm on Tuesday. Altai Scarp (Rupes Altai): [SE/M12] Viewable even through small

Andrew Planck October 2, 2023October 2, 2023 Dates to Observe Objects on the Moon, Lunar Days in October, Multi-ring basin 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)
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