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Astronomer, Teacher, Musician

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Lunar Days in August

Vallis Rheita on the Moon

Vallis Rheita on the Moon

The week of August 19-25 takes us from Day 15 to Day 21. This week we will highlight Vallis Rheita, located in the SE quadrant of the Field Map at N14 and viewable on Wednesday night. Vallis Rheita: [SE/N14; L=52°E]

Andrew Planck August 19, 2024August 16, 2024 Lunar Days in August, Valleys on the Moon No Comments Read more

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

Sinus Iridum Bay of Rainbows on 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

West of Mare Nectaris: Moon Craters Theophilus, Cyrillus, and Catharina

Theophilus is a spectacular formation with all of the attendant complexities of a Tycho-class crater

The week of August 5-11 takes us from Day 1 to Day 7. This week we will highlight the trio of moon craters Theophilus, Cyrillus, and Catharina located in the SE quadrant of the Field Map at L12 and viewable

Andrew Planck August 5, 2024August 2, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in August, Moon craters No Comments Read more

Series of Rilles on the Moon: Rimae Sirsalis

Rimae Sirsalis on the moon

The week of July 29 – August 4 takes us from Day 24 to New Moon. This week we will highlight a series of rilles called Rimae Sirsalis, located in the SW quadrant of the Field Map and viewable on

Andrew Planck July 29, 2024July 30, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in August, Lunar Days in July, Rilles on the Moon, Uncategorized 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

Rima Ariadaeus – Rille on the Moon that is a Graben

Rima Hyginus

The week of August 21-27 takes us from Day 5 to Day 11. This week we will highlight Rima Ariadaeus on the moon, viewable Tuesday night. Rima Ariadaeus: NE/J11; L=14°E] The best place to see rilles on the Moon is

Andrew Planck August 21, 2023September 11, 2023 Dates to Observe Objects on the Moon, Lunar Days in August, Rilles on the Moon No Comments Read more

Messier Moon Crater: Pair of Splash Rays that Resemble Tails of a Comet

Messier small pair of moon craters

The week of August 14-20 takes us from Day 28 to Day 4. This week we will highlight the moon crater Messier, viewable Sunday after midnight. Messier: [SE/K14; L=48°E] One of my favorite objects on the Moon is a small

Andrew Planck August 14, 2023July 30, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in August, Moon craters, Splash Rays on the Moon No Comments Read more

Catena Davy: Moon Crater Chain

Catena Davy: Moon Crater Chain

The week of August 7-13 takes us from Day 21 to Day 27. This week we will highlight Catena Davy on the moon which is viewable Tuesday morning before sunrise. Catena Davy: [SW/L9; L=7°W] This fascinating moon crater chain was

Andrew Planck August 7, 2023July 30, 2023 chain of moon craters, Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in August, Moon craters No Comments Read more

Eudoxus: Complex Moon Crater

Aristoteles is a complex moon crater with terraces

The week of July 31 – August 6 takes us from Day 14 to Day 21. This week we will highlight the moon crater Eudoxus, viewable early Sunday morning before sunrise. Eudoxus: [NE/E11; L=16°E] Both Eudoxus and Aristoteles to its

Andrew Planck July 31, 2023July 30, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in August, Lunar Days in July No Comments Read more

Mare Vaporum on the Moon and September Dates of Note for Space

Mare Vaporum on the moon

The week of August 29 – September 4 takes us from Lunar Day 3 to Day 9. This week we will highlight Mare Vaporum, viewable on Saturday evening. Mare Vaporum: [NE/H10; L=4°E] Notice how there are finger-like projections extending from

Andrew Planck August 29, 2022August 27, 2022 Dates to Observe Objects on the Moon, Lunar Days in August, Mare Patch 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)
  • Petavius: Floor-Fractured Crater on the Moon - October 12, 2026
  • Rimae Sirsalis – One of the Longest Rilles on the Moon - October 5, 2026
  • Moon Crater Aristoteles Adjoins the Moon Crater Mitchell to its Immediate East - September 28, 2026
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