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Astronomer, Teacher, Musician

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Ursid meteor shower

Moon Crater Clavius – Notch in Terminator

Clavius up close on the surface of the moon

The week of May 25-31 takes us from Day 9 to Day 15. This week we will highlight the moon crater Clavius, visible on Tuesday night close to the terminator. Clavius: [SW/Q8; L=14°W] If you catch the Moon at the

Andrew Planck May 25, 2026May 11, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in May, Moon craters No Comments Read more

Clavius – Moon Crater Floor Strewn with Craterlets

floor of moon crater Clavius

The week of December 22-28 takes us from Day 3 to Day 9. This week we will highlight the moon crater Clavius, visible on Sunday night close to the terminator. Clavius: [SW/Q8; L=14°W] If you catch the Moon at the

Andrew Planck December 22, 2025December 9, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in December, Moon craters No Comments Read more

Lunar X on the Moon: Intersection of the Rims of Blanchinus, La Caille, and Purbach

Lunar X

The week of December 16-22 takes us from Lunar Day 16 to Day 22. This week we will highlight an item informally referred to as the “Lunar X,” visible on Sunday night. Lunar X: [SE/M10; L=1°E] Around 6 days 22

Andrew Planck December 16, 2024December 6, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in December 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 Zeeman – Not Visible From Earth - September 7, 2026
  • Moon Crater Bailly – Lies Close to the Western Limb - August 31, 2026
  • Moon Crater Schickard – Wide Central Stripe of Lighter Material - August 24, 2026
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