Andrew Planck

Astronomer, Teacher, Musician

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Purbach

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

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

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

Regiomontanus: Squashed, Oblong Shape Moon Crater

Regiomontanus: Squashed, Oblong Shape Moon Crater

The week of March 25-31 takes us from Day 16 to Day 21. This week we will highlight the moon crater Regiomontanus, located in the SW quadrant of the Field Map at M9. Regiomontanus: [SW/M9; L=1°W] This is a crater

Andrew Planck March 25, 2024March 23, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in March, Moon craters 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 Cassini – Created on Imbrium floor Before Lavas Started to Flow - January 19, 2026
  • Bailly – Largest Crater on Our Side of the Moon - January 12, 2026
  • Longomontanus: Exception to the Rule About Moon Crater Age - January 5, 2026
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