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Andrew Planck

Astronomer, Teacher, Musician

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Month: January 2026

Moon Crater Plato

Plato's original floor is actually 1.5 miles deeper than it appears.

The week of January 26 – February 1 takes us from Day 8 to Day 14. This week we will highlight the moon crater Plato, visible on Tuesday night close to the terminator. Plato: [NW/D9; L=9°W] Wait until the terminator

Andrew Planck January 26, 2026January 28, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in January, Moon craters No Comments Read more

Moon Crater Cassini – Created on Imbrium floor Before Lavas Started to Flow

Cassini crater on the moon

The week of January 19-25 takes us from Day 1 to Day 7. This week we will highlight the moon crater Cassini, visible on Sunday night close to the terminator. Cassini: [NE/E10; L=5°E] Can you tell by looking at Cassini

Andrew Planck January 19, 2026January 28, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in January, Moon craters No Comments Read more

Bailly – Largest Crater on Our Side of the Moon

Bailly – Largest Crater on Our Side of the Moon

The week of January 12-18 takes us from Day 24 to Day 1. This week we will highlight the moon crater Bailly, visible on Tuesday night close to the terminator. Bailly: [SW/R3; L=69°W] To observe this moon crater, it is

Andrew Planck January 12, 2026January 28, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in January, Moon craters No Comments Read more

Longomontanus: Exception to the Rule About Moon Crater Age

Longomontanus moon crater

The week of January 5-11 takes us from Day 17 to Day 23. This week we will highlight the moon crater Longomontanus. Longomontanus: [SW/P7; L=22°W] Take a look at moon crater Longomontanus and before reading further, decide if something seems

Andrew Planck January 5, 2026December 9, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in January, 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)
  • 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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