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Astronomer, Teacher, Musician

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Month: January 2025

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

scarp called Rupes Altai

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

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

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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)
  • One of the Moon’s Loveliest Sights – Moon Crater Plato - March 9, 2026
  • Moon Crater Endymion Resembles Plato - March 2, 2026
  • Maurolycus – Moon Crater in the Lunar Highlands - February 23, 2026
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