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Lunar Days in July

Longomontanus: Moon Crater Age Not Always Determined by Relative Size

Longomontanus on the moon

The week of August 3 – August 9 takes us from Day 21 to Day 26.  This week we will highlight the moon crater Longomontanus, visible on Thursday night close to the terminator. Longomontanus: [SW/P7; L=22°W] Take a look at

Andrew Planck August 3, 2026August 3, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in July, Moon craters No Comments Read more

A Hint of Some Multi-Ring Features – Moon Crater Bailly

Bailly crater on surface of the moon

The week of July 27 – August 2 takes us from Day 7 to Day 13.  This week we will highlight the moon crater Bailly, visible on Tuesday night close to the terminator. Bailly: [SW/R3; L=69°W] To observe this moon

Andrew Planck July 27, 2026July 22, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in July, Moon craters No Comments Read more

Moon Crater Clavius – Small Notch Chiseled Out of the Terminator

Clavius moon crater

The week of July 20-26 takes us from Day 7 to Day 13.  This week we will highlight the moon crater Clavius, visible on Friday night close to the terminator. Clavius: [SW/Q8; L=14°W] If you catch the Moon at the

Andrew Planck July 20, 2026July 14, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in July, Moon craters No Comments Read more

Moon Crater Janssen – Larger Diameter than Copernicus

Janssen Lunar Day 9

The week of July 13-19 takes us from Day 29 to Day 6.  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 July 13, 2026July 8, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in July, Moon craters No Comments Read more

Longomontanus – Exception to the Rule about Moon Craters

crater Longomontanus from space

The week of July 6 to July 12 takes us from Day 22 to Day 28. This week we will highlight the moon crater Longomontanus, visible on Tuesday night close to the terminator. Longomontanus: [SW/P7; L=22°W] Take a look at

Andrew Planck July 6, 2026June 30, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in July, Moon craters No Comments Read more

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

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
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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)
  • Schrödinger – Large Impact Moon Crater Called a Walled Plain - August 10, 2026
  • Longomontanus: Moon Crater Age Not Always Determined by Relative Size - August 3, 2026
  • A Hint of Some Multi-Ring Features – Moon Crater Bailly - July 27, 2026
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