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lunar dates

Rimae Sirsalis – One of the Longest Rilles on the Moon

Sirsalis moon craters

The week of October 5-11 takes us from Day 25 to Day 1. This week we will highlight Rima Sirsalis, visible on Tuesday night close to the terminator. Rimae Sirsalis: [SW/L3-4; L=62°W] Just in from the southwest shore of Oceanus

Andrew Planck October 5, 2026September 30, 2026 Lunar Days in October, Rilles on the Moon No Comments Read more

Clavius – Crater on the Moon

Clavius - crater on the moon

The week of September 21-27 takes us from Day 11 to Day 17. This week we will highlight the moon crater Clavius, visible on Tuesday night close to the terminator. Clavius: [SW/Q8; L=14°W] If you catch the Moon at the

Andrew Planck September 21, 2026September 15, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in September, Moon craters No Comments Read more

Moon Crater Maginus

Maginus moon crater

The week of September 14-20 takes us from Day 4 to Day 10.  This week we will highlight the moon crater Maginus, visible on Saturday night close to the terminator. Maginus: [SW/Q9; L=6°W] Located at the eastern tip of the

Andrew Planck September 14, 2026September 10, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in September, Moon craters No Comments Read more

Moon Crater Zeeman – Not Visible From Earth

crater zeeman on the surface of the moon

The week of September 7 – 13 takes us from Day 26 to Day 3.  This week we will highlight the moon crater Zeeman, visible on Friday night close to the terminator. Moon crater Zeeman is a huge, ancient crater

Andrew Planck September 7, 2026September 10, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in September No Comments Read more

Moon Crater Bailly – Lies Close to the Western Limb

moon crater Bailly location on the moon

The week of August 31 – September 6 takes us from Day 12 to Day 18. 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 August 31, 2026August 25, 2026 Craters on the Moon, Lunar Days in August, Moon craters No Comments Read more

Moon Crater Clavius – Small Notch Out of Terminator of the Moon

Clavius Crater on the moon

The week of August 17-23 takes us from Day 5 to Day 11. This week we will highlight the moon crater Clavius, visible on Saturday night close to the terminator. Clavius: [SW/Q8; L=14°W] If you catch the Moon at the

Andrew Planck August 17, 2026August 11, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in August, Moon craters No Comments Read more

Schrödinger – Large Impact Moon Crater Called a Walled Plain

Schrodinger moon crater

The week of August 10 takes us from Day 28 to Day 4. This week we will highlight the moon crater Schrodinger, visible on Thursday night close to the terminator. Schrödinger is a large impact moon crater of the form

Andrew Planck August 10, 2026August 6, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in August, Moon craters No Comments Read more

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
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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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