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Mare Imbrium

The Bay of Rainbows on the Moon – Sinus Iridum

Sinus Iridum on the moon - the Bay of Rainbows

The week of February 5-11 takes us from Day 25 to Day 2. This week we will highlight Sinus Iridum, viewable on Tuesday. Sinus Iridum: [NW/E6; L=32°W] Sinus Iridum (the Bay of Rainbows), located in the northwest sector of Mare

Andrew Planck February 5, 2024January 31, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in February, Moon craters, Subsidence on the Moon, Wrinkle Ridge on the moon No Comments Read more

Three Imposing Moon Craters: Theophilus, Cyrillus, and Catharina

Theophilus on the moon

The week of January 15-21 takes us from Day 5 to Day 11. This week we will highlight the moon craters Theophilus, Cyrillus, and Catharina, viewable on Tuesday night. Day 6 (T=10° E.) Theophilus, Cyrillus, Catharina: [Repeated from Day 5–SE/L12;

Andrew Planck January 15, 2024January 10, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in January, Moon craters No Comments Read more

Eye-Catching Pair of Moon Craters – Aristoteles and Eudoxus

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

Apennine Mountain Range 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

trio of moon craters

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

The Most Spectacular Feature on the Moon

Montes Apenninus on the moon and Apennine Mountain Range

The week of July 24 – July 30 takes us from Day 7 to Day 13. This week we will highlight the Apennine Mountains, viewable on Tuesday evening. Montes Apenninus: [NW/H9-G10; L=4°W] The Apennine Mountain Range is the most spectacular

Andrew Planck July 24, 2023July 19, 2023 Dates to Observe Objects on the Moon, Lunar Days in July, Mountain Ranges on the Moon No Comments Read more

Moon Craters in Fra Mauro Region Critical to Understanding Important Process That Shaped the Moon

Fra Mauro region on the moon

The week of July 10 – July 16 takes us from Day 22 to Day 29. This week we will highlight moon craters in the Fra Mauro region, viewable before sunrise on Tuesday. Fra Mauro region: [SW/K8; L=17°W] Moon craters

Andrew Planck July 10, 2023July 6, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in July, Moon craters No Comments Read more

Mare Imbrium – One Time Multi-Ring Basin on the Moon

Mare Imbrium

The week of June 26-July 2nd takes us from Day 8 to Day 14. This week we will highlight Mare Imbrium on the moon, which should be 80% visible on Tuesday evening. The Moon has now entered its gibbous phase

Andrew Planck June 26, 2023June 28, 2023 Lunar Days in June, Multi-ring basin on the moon No Comments Read more

Apennine Mountain Range – Most Spectacular Feature on the Moon

Montes Apenninus the Apennine Mountains lunar day 5

The week of April 24-30 takes us from Day 5 to Day 10. This week we will highlight Montes Apenninus, the Apennine Mountains, viewable on Thursday and Friday nights. Montes Apenninus: [NW/H9-G10; L=4°W] The Apennine Mountain Range is the most

Andrew Planck April 24, 2023April 22, 2023 Dates to Observe Objects on the Moon, Lunar Days in April, Mountain Ranges on the Moon No Comments Read more

Craters in the Fra Mauro Region: Critical to Understanding an Important Process that Shaped the Moon

Fra Mauro on the moon

The week of April 10-16 takes us from Day 20 to Day 26. This week we will highlight moon craters in the Fra Mauro region, located in the SW quadrant of the Field Map at K8, and viewable early Thursday

Andrew Planck April 10, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April, Rilles on the Moon, Saturn 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 Schickard has Stripes - May 11, 2026
  • Examples of Subsidence on the Moon: Moon Craters Posidonius and le Monnier - May 4, 2026
  • Endymion – Moon Crater - April 27, 2026
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