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Bay of Rainbows

Sinus Iridum – Bay of Rainbows on the Moon

Sinus Iridum

The week of April 7-13 takes us from Lunar Day 10 to Day 16. This week we will highlight Sinus Iridum, visible on Tuesday night close to the terminator. Sinus Iridum: [NW/E6; L=32°W] Sinus Iridum (the Bay of Rainbows), located

Andrew Planck April 7, 2025April 3, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April, Moon craters, Uncategorized 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

Sinus Iridum, the Bay of Rainbows on the Moon

Sinus Iridum (the Bay of Rainbows), located in the northwest sector of Mare Imbrium, formed after the Imbrium impact but before the lava flooding that filled the Imbrium basin.

The week of September 9-15 takes us from Day 11 to Day 16. This week we will highlight Sinus Iridum, the Bay of Rainbows, viewable on Monday evening. Sinus Iridum: [NW/E6] Sinus Iridum (the Bay of Rainbows), located in the

Andrew Planck September 9, 2019 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in September No Comments Read more

The Bay of Rainbows and Black Holes

Sinus Iridum, the Bay of Rainbows, located in the northwest sector of Mare Imbrium

The week of April 15-21 takes us from Day 11 to Day 17. This week we will highlight Sinus Iridum, viewable on Monday evening. Sinus Iridum: [NW/E6] Sinus Iridum (the Bay of Rainbows), located in the northwest sector of Mare

Andrew Planck April 15, 2019April 14, 2019 Apps for Observing the Moon and Objects, Dates to Observe Objects on the Moon, Lunar Days in April, Unusual Features 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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