Andrew Planck

Astronomer, Teacher, Musician

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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

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

Trio of Moon Craters with Distinct Personalities

Trio of Moon Craters with Distinct Personalities

The week of April 22-28 takes us from Day 14 to Day 19. This week we will highlight the moon craters Theophilus, Cyrillus, and Catharina viewable on Sunday morning before sunrise and located in the SE quadrant of the Field

Andrew Planck April 22, 2024April 18, 2024 chain of moon craters, Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April, Moon craters 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

The Most Imposing Trio of Craters on the Moon

The Most Imposing Trio of Craters on the Moon

The week of July 17 – July 23 takes us from New Moon to Day 6. This week we will highlight the trio of craters Theophilus, Cyrillus, and Catharina, viewable on Sunday night. Theophilus, Cyrillus, Catharina: [SE/L12; L=24°E] This is

Andrew Planck July 17, 2023July 19, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in July, Moon craters No Comments Read more

Archimedes: Prominent 50-mile Moon Crater with Terraces

Archimedes: Prominent 50-mile Moon Crater with Terraces

The week of July 3 – July 9 takes us from Day 15 to Day 22. This week we will highlight the moon crater Archimedes, viewable after midnight on Sunday. Archimedes1: [NW/G9; L=4°W] This is a prominent 50-mile moon crater

Andrew Planck July 3, 2023July 3, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in July No Comments Read more

Mare Imbrium – One Time Multi-Ring Basin on the Moon

Mare Imbrium – One Time Multi-Ring Basin on the Moon

The week of June 26-July 2nd takes us from Day 8 to Day 14. This week we will highlight Mare Imbrium on the moon, which should be 80% visible on Tuesday evening. The Moon has now entered its gibbous phase

Andrew Planck June 26, 2023June 28, 2023 Lunar Days in June, Multi-ring basin on the moon No Comments Read more

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

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

The week of April 18-24 takes us from Day 17 to Day 24. This week we will highlight the craters Theophilus, Cyrillus, and Catharina, viewable on Tuesday night. Theophilus, Cyrillus, Catharina: [SE/L12] This is the most imposing trio of craters

Andrew Planck April 18, 2022April 18, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April No Comments Read more

Imbrium Basin and Caucasus Mountains on the Moon

Imbrium Basin and Caucasus Mountains on the Moon

The week of July 12-18 takes us from Lunar Day 3 to Day 9. This week we will highlight the Imbrium Basin, half of which is viewable on Saturday evening, and the Caucasus Mountains, best viewed on Friday evening. Mare

Andrew Planck July 12, 2021July 11, 2021 Lunar Days in July, 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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