Andrew Planck

Astronomer, Teacher, Musician

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Serenitatis Basin

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

Rupes Cauchy: A Best Known Fault on the Moon

Rupes Cauchy: A Best Known Fault on the Moon

The week of July 22-28 takes us from Day 17 to Day 23. This week we will highlight Rupes Cauchy, viewable on Wednesday night and located in the NE quadrant of the Field Map at J13. Rupes Cauchy: [NE/J13; L=37°

Andrew Planck July 22, 2024July 19, 2024 Dates to Observe Objects on the Moon, Faults on the Moon, Lunar Days in July, Rilles on the Moon No Comments Read more

Two Faults on the Moon Paralleled by a Nearby Rille

Two Faults on the Moon Paralleled by a Nearby Rille

The week of May 6-12 takes us from Day 28 to Day 5. This week we will highlight Rupes Cauchy, viewable on Sunday evening, May12, Day 5, and located in the NE quadrant of the Field Map at J13. Rupes

Andrew Planck May 6, 2024May 3, 2024 Dates to Observe Objects on the Moon, Faults on the Moon, Lunar Days in May No Comments Read more

Two of the Best-Known Faults on the Moon

Two of the Best-Known Faults on the Moon

The week of May 8-14 takes us from Day 18 to Day 24. This week we will highlight Rupes Cauchy, a fault on the moon, viewable on Tuesday before sunrise. Rupes Cauchy: [NE/J13; L=37°E] Two of the best-known faults on

Andrew Planck May 8, 2023April 22, 2023 Dates to Observe Objects on the Moon, Faults on the Moon, Lunar Days in May, Rilles on the Moon, Saturn No Comments Read more

Rupes Recta and Rupes Cauchy: Two of the Best-Known Faults on the Moon

Rupes Recta and Rupes Cauchy: Two of the Best-Known Faults on the Moon

The week of December 26 – January 1 takes us from Lunar Day 4 to Day 10. This week we will highlight the fault Rupes Cauchy located on the moon in the NE quadrant of the Field Map and viewable

Andrew Planck December 26, 2022December 20, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Faults on the Moon, Lunar Days in December, Rilles on the Moon No Comments Read more

Two of the Best-Known Faults on the Moon

Two of the Best-Known Faults on the Moon

The week of April 22-28 takes us from Day 18 to Day 24. This week we will highlight Rupes Cauchy, viewable early Tuesday morning. Rupes Cauchy1: [NE/J13; L=37°E] Two of the best-known faults on the Moon are Rupes Cauchy and

Andrew Planck April 22, 2019April 21, 2019 Faults on the Moon, Lunar Days in April, Lunar Observers, Rilles 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)
  • Moon Crater Janssen Located 85 miles Southwest of the Rheita Valley - July 7, 2025
  • Albategnius – How to Observe This Stunning Moon Crater Near the Terminator - June 30, 2025
  • Vallis Rheita: The Moon’s Longest Valley and a Stunning Lunar Observation Target This Week - June 23, 2025
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