Andrew Planck

Astronomer, Teacher, Musician

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Jura Mountains

Sinus Iridum – Bay of Rainbows on the Moon

Sinus Iridum – Bay of Rainbows on the Moon

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

Sinus Iridum – the Bay of Rainbows – Crater on the Moon

Sinus Iridum – the Bay of Rainbows – Crater on the Moon

The week of August 12-18 takes us from Day 8 to Day 15 This week we will highlight Sinus Iridum, located in the NW quadrant of the Field Map at E6 and viewable on Wednesday night. Sinus Iridum: [NW/E6; L=32°W]

Andrew Planck August 12, 2024August 9, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in August, Subsidence on the Moon, Wrinkle Ridge on the moon No Comments Read more

The Bay of Rainbows on the Moon – Sinus Iridum

The Bay of Rainbows on the Moon – Sinus Iridum

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

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

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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)
  • Clavius – Moon Crater Strewn with Craterlets - June 16, 2025
  • Furnerius – Southernmost Moon Crater That Makes Up the Great Eastern Chain - June 9, 2025
  • Albategnius – 85 mile Complex Moon Crater - June 2, 2025
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