Andrew Planck

Astronomer, Teacher, Musician

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The Bay of Rainbows, Sinus Iridum, on the Moon

The Bay of Rainbows, Sinus Iridum, on the Moon

The week of September 5-11 takes us from Lunar Day 10 to Day 17. This week we will highlight Sinus Iridum, viewable on Tuesday evening. Sinus Iridum: [NW/E6] Sinus Iridum (the Bay of Rainbows), located in the northwest sector of

Andrew Planck September 5, 2022August 30, 2022 Dates to Observe Objects on the Moon, Lunar Days in September, Lunar Observers, Subsidence on the Moon No Comments Read more

Most Spectacular Example of Subsidence on the Moon: Sinus Iridum

Most Spectacular Example of Subsidence on the Moon: Sinus Iridum

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 on the Moon: The Bay of Rainbows

Sinus Iridum on the Moon: The Bay of Rainbows

The week of December 13-19 takes us from Day 10 to Day 16. This week we will highlight Sinus Iridum, located in the northwest sector of Mare Imbrium. Sinus Iridum: [NW/E6] Sinus Iridum (the Bay of Rainbows) formed after the

Andrew Planck December 13, 2021December 12, 2021 Lunar Days in December, Subsidence on the Moon No Comments Read more

The Bay of Rainbows and Black Holes

The Bay of Rainbows and Black Holes

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 Aristoteles, Close to the Terminator - November 10, 2025
  • Complex Moon Crater Pythagoras - November 3, 2025
  • Theophilus, Cyrillus, Catharina Moon Craters West of Mare Nectaris - October 27, 2025
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