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Astronomer, Teacher, Musician

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Month: July 2026

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

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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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