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Mare Nectaris

Rupes Altai: Scarp on the Moon

scarp called Rupes Altai

The week of October 2-8 takes us from Day 19 to Day 25. This week we will highlight a scarp on the moon called Rupes Altai, visible after 10:00pm on Tuesday. Altai Scarp (Rupes Altai): [SE/M12] Viewable even through small

Andrew Planck October 2, 2023October 2, 2023 Dates to Observe Objects on the Moon, Lunar Days in October, Multi-ring basin on the moon No Comments Read more

Multi-Ring Basin on the Moon – Mare Nectaris

Nectaris basin on the moon excavated 3.9 billion years ago

The week of August 28 – September 3 takes us from Day 13 to Day 20. This week we will highlight Mare Nectaris on the moon, which is viewable Sunday night in the SE quadrant of Lunar Map at L13.

Andrew Planck August 28, 2023August 25, 2023 Dates to Observe Objects on the Moon, Lunar Days in August, Multi-ring basin on the moon No Comments Read more

Vallis Rheita: Series of Interlocking Moon Craters

Rheita Valley on the moon

The week of February 6-12 takes us from Lunar Day 16 to Day 21. This week we will highlight Vallis Rheita, located in the SE quadrant of the Field Map and viewable on Tuesday night. Vallis Rheita: [SE/N14; L=52°E] At

Andrew Planck February 6, 2023February 6, 2023 chain of moon craters, Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in February No Comments Read more

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

Theophilus, Cyrillus, Catharina moon craters

The week of April 18-24 takes us from Day 17 to Day 24. This week we will highlight the craters Theophilus, Cyrillus, and Catharina, viewable on Tuesday night. Theophilus, Cyrillus, Catharina: [SE/L12] This is the most imposing trio of craters

Andrew Planck April 18, 2022April 18, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April No Comments Read more

Rheita Valley – Longest Distinct Valley on the Moon

Rheita Valley is the longest distinct valley on the Moon

The week of December 6-12 takes us from Day 3 to Day 9. This week we will highlight Vallis Rheita, viewable on Tuesday & Wednesday evening, Days 4 and 5. Vallis Rheita: [SE/N14; L=52°E] At 276 miles, the Rheita Valley

Andrew Planck December 6, 2021December 5, 2021 Unusual Features on the Moon, Valleys on the Moon No Comments Read more

Moon Crater Fracastorius: One of the Best Examples of Subsidence

Fracastorius is one of the Moon's best examples of subsidence

The week of August 9-15 takes us from Lunar Day 2 to Day 8. This week we will highlight the crater Fracastorius, viewable Thursday evening. Fracastorius: [SE/M13] Located on the south shore of Mare Nectaris, this is one of the

Andrew Planck August 9, 2021August 7, 2021 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in August, Uncategorized No Comments Read more

The Most Imposing Trio of Craters on the Moon

Theophilus, Cyrillus, Catharina moon craters

The week of March 11-17 takes us from Day 5 to Day 11. This week we will highlight the trio of craters Theophilus, Cyrillus, and Catharina, viewable right next to the terminator on Monday evening, and on Tuesday evening. Theophilus,

Andrew Planck March 11, 2019March 11, 2019 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in March, Unusual Features on the Moon, Uranus 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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