Andrew Planck

Astronomer, Teacher, Musician

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Lunar Days in August

Apennine Mountain Range on the Moon – Most Spectacular Feature

Apennine Mountain Range on the Moon – Most Spectacular Feature

The week of August 25-31 takes us from Day 25 to Day 9. This week we will highlight Montes Apenninus, visible on Sunday night close to the terminator. Montes Apenninus: [NW/H9-G10; L=4°W] The Apennine Mountain Range is the most spectacular

Andrew Planck August 25, 2025August 22, 2025 Lunar Days in August, Mountain Ranges on the Moon No Comments Read more

Reiner Gamma and Lunar Swirls on the Moon

Reiner Gamma and Lunar Swirls on the Moon

The week of August 18-24 takes us from Day 25 to Day 2. This week we will highlight the Reiner Gamma, visible on Tuesday & Wednesday nights close to the terminator. Reiner Gamma: [NW/J4; L=59°W] Lunar swirls are absolutely flat

Andrew Planck August 18, 2025August 14, 2025 Lunar Days in August, Lunar Swirls, Unusual Features on the Moon No Comments Read more

Moon Crater Janssen – 85 miles Southwest of the Rheita Valley

Moon Crater Janssen – 85 miles Southwest of the Rheita Valley

The week of August 11-17 takes us from Day 18 to Day 24. This week we will highlight the moon crater Janssen visible on Tuesday night close to the terminator. Janssen: [SE/P13; L=40°E] Janssen is located 85 miles southwest of

Andrew Planck August 11, 2025August 7, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in August, Moon craters, Rilles on the Moon No Comments Read more

Schickard: Moon Crater Floor with Stripes

Schickard: Moon Crater Floor with Stripes

The week of August 4-10 takes us from Day 11 to Day 17. This week we will highlight the moon crater Schickard, visible on Wednesday night close to the terminator. Schickard: [SW/P4; L=55°W] When you look at moon crater Schickard,

Andrew Planck August 4, 2025July 30, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in August, Moon craters No Comments Read more

The Longest Distinct Valley on the Moon – Rheita Valley

The Longest Distinct Valley on the Moon – Rheita Valley

The week of July 28 – August 3 takes us from Day 4 to Day 10. This week we will highlight the Rheita Valley on the moon, visible on Tuesday night close to the terminator. Vallis Rheita: [SE/N14; L=52°E] At

Andrew Planck July 28, 2025July 28, 2025 Lunar Days in August, Lunar Days in July, Moon craters, Valleys on the Moon No Comments Read more

Lunar Swirl Reiner Gamma and the Struve/Russel Moon Crater

Lunar Swirl Reiner Gamma and the Struve/Russel Moon Crater

The week of August 26 – September 1 takes us from Day 22 to Day 29. This week we will highlight the lunar swirl Reiner Gamma and the Struve/Russel moon crater, located in the NW quadrant of the Field Map

Andrew Planck August 26, 2024August 22, 2024 Craters on the Moon, Lunar Days in August, Lunar Swirls, Moon craters No Comments Read more

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 – 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

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

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

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

Series of Rilles on the Moon: Rimae Sirsalis

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
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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)
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  • Bailly – Largest Crater on Our Side of the Moon - January 12, 2026
  • Longomontanus: Exception to the Rule About Moon Crater Age - January 5, 2026
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