Andrew Planck

Astronomer, Teacher, Musician

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Lunar Days in December

Montes Apenninus on the Moon

Montes Apenninus on the Moon

The week of December 18-24 takes us from Day 7 to Day 13. This week we will highlight Montes Apenninus, viewable on Tuesday and Wednesday nights. Montes Apenninus: The Apennine Mountain Range [NW/G9] is the most spectacular feature on the

Andrew Planck December 18, 2023December 17, 2023 Dates to Observe Objects on the Moon, Lunar Days in December, Mountain Ranges on the Moon No Comments Read more

Theophilus, Cyrillus, Catharina – The Most Imposing Trio of Craters on the Moon

Theophilus, Cyrillus, Catharina – The Most Imposing Trio of Craters on the Moon

The week of December 11-17 takes us from Day 29 to Day 6. This week we will highlight the moon craters Theophilus, Cyrillus, and Catherina, viewable on Sunday evening. Theophilus, Cyrillus, Catharina: [SE/L12] This is the most imposing trio of

Andrew Planck December 11, 2023December 9, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in December No Comments Read more

Moon Crater Pytheas with its Secondary Craters

Moon Crater Pytheas with its Secondary Craters

The week of December 4-10 takes us from Day 22 to Day 27. This week we will highlight the moon crater Pytheas with its secondary craters, viewable on Tuesday after midnight. Pytheas secondary moon craters: [NW/G7-8; L=19°W] The best place

Andrew Planck December 4, 2023November 30, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in December, Splash Rays on the Moon, Uncategorized 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

Maurolycus – Largest and Most Conspicuous Moon Crater in Lunar Highlands

Maurolycus – Largest and Most Conspicuous Moon Crater in Lunar Highlands

The week of December 12 – 18 takes us from Lunar Day 19 to Day 25. This week we will highlight the moon crater Maurolycus, located in the SE quadrant of the Field Map and viewable Tuesday evening around 11:00pm.

Andrew Planck December 12, 2022December 7, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in December, Unusual Features on the Moon No Comments Read more

Moon Crater Gutenberg – Unusual Sequence of Moon Crater Development

Moon Crater Gutenberg – Unusual Sequence of Moon Crater Development

The week of December 5 – 11 takes us from Lunar Day 13 to Day 19. This week we will highlight the moon crater Gutenberg, located in the SE quadrant of the Field Map. Gutenberg: [SE/K14; L=41°E] Gutenberg crater is

Andrew Planck December 5, 2022December 6, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in December, Uncategorized, Unusual Features on the Moon No Comments Read more

Moon Craters Aristoteles and Julius Caesar

Moon Craters Aristoteles and Julius Caesar

The week of November 28 – December 4 takes us from Lunar Day 6 to Day 12. This week we will highlight the moon craters Aristoteles & Julius Caesar, found in the NE quadrant of the Field Map. Aristoteles: [NE/D11;

Andrew Planck November 28, 2022November 27, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in December, Lunar Days in November No Comments Read more

Hippalus Rilles on the Moon

Hippalus Rilles on the Moon

The week of December 27 – January 2 takes us from Day 23 to New Moon. This week we will highlight the Hippalus Rilles located in the SW quadrant of the Field Map at M6 and viewable on Tuesday morning.

Andrew Planck December 27, 2021December 23, 2021 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in December, Rilles on the Moon No Comments Read more

Moon Crater Proclus: One of the Brightest Spots on the Moon

Moon Crater Proclus: One of the Brightest Spots on the Moon

The week of December 20-26 takes us from Day 17 to Day 21. This week we will highlight the crater Proclus located in the NE quadrant of the Field Map at H14, the Ursid meteor shower, and the Winter Solstice.

Andrew Planck December 20, 2021December 20, 2021 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in December No Comments Read more

Sinus Iridum on the Moon: The Bay of Rainbows

Sinus Iridum on the Moon: The Bay of Rainbows

The week of December 13-19 takes us from Day 10 to Day 16. This week we will highlight Sinus Iridum, located in the northwest sector of Mare Imbrium. Sinus Iridum: [NW/E6] Sinus Iridum (the Bay of Rainbows) formed after the

Andrew Planck December 13, 2021December 12, 2021 Lunar Days in December, Subsidence 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)
  • Sinus Iridum – The Bay of Rainbows Located in the Northwest Sector of Mare Imbrium - February 9, 2026
  • Moon Crater Endymion - February 2, 2026
  • Moon Crater Plato - January 26, 2026
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