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Andrew Planck

Astronomer, Teacher, Musician

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Month: July 2025

The Longest Distinct Valley on the Moon – Rheita Valley

Petavius and 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

Moon Crater Humboldt

Moon Crater Humboldt

The week of July 21-27 takes us from Day 27 to Day 3. This week we will highlight the moon crater Humboldt, visible on Saturday night close to the terminator. Humboldt:1 [SE/M18] This moon crater is best viewed when there

Andrew Planck July 21, 2025July 17, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in July, Moon craters No Comments Read more

Moon Crater Maurolycus in the Lunar Highlands

Maurolycus crater on the moon

The week of July 14-20 takes us from Day 20 to Day 26. This week we will highlight the moon crater Maurolycus, visible on Tuesday night close to the terminator. Maurolycus: [SE/P11; L=14°E] Let us venture briefly into a region

Andrew Planck July 14, 2025July 9, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in July No Comments Read more

Moon Crater Janssen Located 85 miles Southwest of the Rheita Valley

Moon Crater Janssen Located 85 miles Southwest of the Rheita Valley

The week of July 7-13 takes us from Day 13 to Day 19. This week we will highlight the moon crater Janssen, visible on Saturday and Sunday nights close to the terminator. Janssen: [SE/P13; L=40°E] Janssen is located 85 miles

Andrew Planck July 7, 2025July 3, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in July, Moon craters, Rilles 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)
  • One of the Moon’s Loveliest Sights – Moon Crater Plato - March 9, 2026
  • Moon Crater Endymion Resembles Plato - March 2, 2026
  • Maurolycus – Moon Crater in the Lunar Highlands - February 23, 2026
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