Andrew Planck

Astronomer, Teacher, Musician

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Posidonius

Moon Crater Fra Mauro and Apollo 14 Astronauts

Moon Crater Fra Mauro and Apollo 14 Astronauts

The week of September 29 – October 5 takes us from Day 8 to Day 14. This week we will highlight the moon crater Fra Mauro, visible on Tuesday night close to the terminator. Fra Mauro region: [SW/K8; L=17°W] Moon

Andrew Planck September 29, 2025September 27, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in October, Lunar Observers, Moon craters, Rilles on the Moon, Simple Moon Craters No Comments Read more

Posidonius and le Monnier – Two Moon Craters on Mare Serenitatis

Posidonius and le Monnier – Two Moon Craters on Mare Serenitatis

The week of March 3-9 takes us from Lunar Day 4 to Day 10. This week we will highlight the moon craters Posidonius and le Monnier visible on Tuesday night. Posidonius/le Monnier: [NE/F-G13; L=30°E] There are only two craters of

Andrew Planck March 3, 2025February 27, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Floor Fractured Moon Craters, Lunar Days in March, Moon craters No Comments Read more

Moon Craters Posidonius and le Monnier – Examples of Subsidence

Moon Craters Posidonius and le Monnier – Examples of Subsidence

The week of March 7-13 takes us from Day 5 to Day 11. This week we will highlight moon craters Posidonius and le Monnier, viewable on Tuesday evening. Posidonius/le Monnier: [NE/F-G13; L=30°E] There are only two craters of any consequence

Andrew Planck March 7, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in March, Subsidence on the Moon No Comments Read more

Moon Craters on Mare Serenitatis: Posidonius and le Monnier

Moon Craters on Mare Serenitatis: Posidonius and le Monnier

The week of Aug. 23-29 takes us from Lunar Day 17 to Day 22. This week we will highlight the craters Posidonius and le Monnier, viewable late Thurs. night. Posidonius/le Monnier: [NE/F-G13] There are only two craters of any consequence

Andrew Planck August 23, 2021August 23, 2021 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in August 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)
  • Bailly – Largest Crater on Our Side of the Moon - January 12, 2026
  • Longomontanus: Exception to the Rule About Moon Crater Age - January 5, 2026
  • Schickard: Terrain Made Up of Two Different Chemical Compositions - December 29, 2025
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