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Cassini

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

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

Most Spectacular Example of Subsidence on the Moon: Sinus Iridum

Sinus Iridum on the moon

The week of January 10-16 takes us from Day 9 to Day 14. This week we will highlight Sinus Iridum, viewable on Wednesday and Thursday evenings. Sinus Iridum: [NW/E6; L=32°W] Sinus Iridum (the Bay of Rainbows), located in the northwest

Andrew Planck January 10, 2022January 9, 2022 Dates to Observe Objects on the Moon, Lunar Days in January, 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)
  • Moon Crater Endymion Resembles Plato - March 2, 2026
  • Maurolycus – Moon Crater in the Lunar Highlands - February 23, 2026
  • Moon Craters Langrenus and Vendelinus – First Two Segments of the Great Eastern Chain - February 16, 2026
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