Andrew Planck

Astronomer, Teacher, Musician

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Lunar Days in January

Rupes Cauchy and Rupes Recta – Best Known Faults on the Moon

Rupes Cauchy and Rupes Recta – Best Known Faults on the Moon

The week of January 27 – February 2 takes us from Lunar Day 28 to Day 5. This week we will highlight Rupes Cauchy, visible on Sunday night close to the terminator. Rupes Cauchy: [NE/J13; L=37°E] Two of the best-known

Andrew Planck January 27, 2025January 27, 2025 Dates to Observe Objects on the Moon, Faults on the Moon, Lunar Days in February, Lunar Days in January, Rilles on the Moon No Comments Read more

Pytheas Secondary Moon Craters

Pytheas Secondary Moon Craters

The week of January 20-26 takes us from Lunar Day 21 to Day 27. This week we will highlight the Pytheas secondary moon craters, visible on Tuesday night and Wednesday night close to the terminator. Pytheas secondary craters: [NW/G7-8; L=19°W]

Andrew Planck January 20, 2025January 16, 2025 Craters on the Moon, Lunar Days in January, 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

Most Spectacular Feature on the Moon – Apennine Mountain Range

Most Spectacular Feature on the Moon – Apennine Mountain Range

The week of January 6-12 takes us from Lunar Day 7 to Day 13. This week we will highlight the Apennine mountains, visible on Tuesday night. Montes Apenninus: The Apennine Mountain Range is the most spectacular feature on the Moon

Andrew Planck January 6, 2025December 6, 2024 Dates to Observe Objects on the Moon, Lunar Days in January, Mountain Ranges on the Moon No Comments Read more

Moon Crater Fracastorius – Best Example of Subsidence

Moon Crater Fracastorius – Best Example of Subsidence

The week of January 29 – February 4 takes us from Day 18 to Day 24 This week we will highlight the moon crater Fracastorius, viewable on Tuesday. Fracastorius: [SE/M13; L=33°E] Located on the south shore of Mare Nectaris, this

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

Mare Orientale: Moon’s Greatest and Most Pristine Example of a Multi-Ring Impact Basin

Mare Orientale: Moon’s Greatest and Most Pristine Example of a Multi-Ring Impact Basin

The week of January 22-28 takes us from Day 12 to Day 18. This week we will highlight Mare Orientale on the moon, viewable on Tuesday. Mare Orientale/Cordillera Mountains: [SW/L-M libration zone; L=82°W] It is a pity that we are

Andrew Planck January 22, 2024January 19, 2024 Lunar Days in January, Multi-ring basin on the moon No Comments Read more

Three Imposing Moon Craters: Theophilus, Cyrillus, and Catharina

Three Imposing Moon Craters: Theophilus, Cyrillus, and Catharina

The week of January 15-21 takes us from Day 5 to Day 11. This week we will highlight the moon craters Theophilus, Cyrillus, and Catharina, viewable on Tuesday night. Day 6 (T=10° E.) Theophilus, Cyrillus, Catharina: [Repeated from Day 5–SE/L12;

Andrew Planck January 15, 2024January 10, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in January, Moon craters No Comments Read more

Taruntius: Floor-Fractured Moon Crater

Taruntius: Floor-Fractured Moon Crater

The week of January 8-14 takes us from Day 27 to Day 4. This week we will highlight the moon crater Taruntius viewable on Sunday night and found in the NE quadrant of the Field Map at J4. Taruntius: [NE/J14;

Andrew Planck January 8, 2024January 5, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Floor Fractured Moon Craters, Lunar Days in January No Comments Read more

Catena Davy – Fascinating Moon Crater Chain

Catena Davy – Fascinating Moon Crater Chain

The week of January 1-7 takes us from Day 21 to Day 26. This week we will highlight the Catena Davy viewable on Tuesday night and found in the SW quadrant of the Field Map. Catena Davy: [SW/L9; L=7°W] This

Andrew Planck January 1, 2024December 17, 2023 chain of moon craters, Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in January, Moon craters No Comments Read more

Mare Frigoris on the Moon and the Gargantuan Hypothesis

Mare Frigoris on the Moon and the Gargantuan Hypothesis

The week of January 30 to February 5 takes us from Lunar Day 10 to Day 15. This week we will highlight Mare Frigoris, located in the NE quadrant of the Field Map and viewable on Tuesday evening. Mare Frigoris:

Andrew Planck January 30, 2023January 25, 2023 Gargantuan hypothesis, Lunar Days in January 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
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  • Albategnius – How to Observe This Stunning Moon Crater Near the Terminator - June 30, 2025
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