Andrew Planck

Astronomer, Teacher, Musician

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Lunar Days in December

Trio of Moon Craters, Theophilus, Cyrillus,and Catharina

Trio of Moon Craters, Theophilus, Cyrillus,and Catharina

The week of December 30-Jan 5 takes us from Lunar Day 0 to Day 6. This week we will highlight the trio of moon craters, Theophilus, Cyrillus,and Catharina, visible on Saturday night. Theophilus, Cyrillus, Catharina: [Repeated from Day 5–SE/L12; L=24°E]

Andrew Planck December 30, 2024December 6, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in December, Moon craters No Comments Read more

Rimae Sirsalis: Two Small Overlapping Moon Craters – Sirsalis and Sirsalis A

The week of December 23-29 takes us from Lunar Day 23 to Day 29. This week we will highlight a feature called Rimae Sirsalis, visible on Thursday night. Rimae Sirsalis: [SW/L3-4; L=62°W] Just in from the southwest shore of Oceanus

Andrew Planck December 23, 2024December 6, 2024 chain of moon craters, Lunar Days in December, Rilles on the Moon No Comments Read more

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

Moon Crater Schickard

Moon Crater Schickard

The week of December 9-15 takes us from Lunar Day 9 to Day 15. This week we will highlight the moon crater Schickard, visible on Thursday night. Schickard: [SW/P4; L=55°W] When you look at Schickard, you should immediately notice something

Andrew Planck December 9, 2024December 9, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in December No Comments Read more

Moon Crater Rima Hyginus – Line of Linked Craters

Moon Crater Rima Hyginus – Line of Linked Craters

The week of December 2 – December 8 takes us from Lunar Day 2 to Day 8. This week we will highlight Rima Hyginus, visible on Saturday night. Rima Hyginus: [NE/J10; L=8°E] At the west end of the Ariadaeus rille,

Andrew Planck December 2, 2024November 21, 2024 chain of moon craters, Craters on the Moon, Lunar Days in December, Moon craters, Rilles on the Moon No Comments Read more

Eye-Catching Pair of Moon Craters – Aristoteles and Eudoxus

Eye-Catching Pair of Moon Craters – Aristoteles and Eudoxus

The week of December 25-31 takes us from Day 14 to Day 20. This week we will highlight the moon craters Aristoteles and Julius Caesar, viewable on Sunday night and found in the NE quadrant of the Field Map. Aristoteles:

Andrew Planck December 25, 2023December 17, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in December, Moon craters No Comments Read more

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
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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
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