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Astronomer, Teacher, Musician

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Moon craters

Petavius: Floor-Fractured Moon Crater

Day 3 Petavius moon crater

The week of June 15-21 takes us from Day 1 to Day 7.  This week we will highlight the moon crater Petavius, visible on Tuesday night close to the terminator. Petavius: [SE/M16; L=60°E] This is one of the most fascinating

Andrew Planck June 15, 2026June 10, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in June, Moon craters No Comments Read more

Moon Crater Bailly – Over 3 Billion Years Old

moon crater Bailly on surface of the moon

The week of June 1-7 takes us from Day 16 to Day 22. 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 crater, it is

Andrew Planck June 1, 2026June 2, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in June, Moon craters No Comments Read more

Moon Crater Clavius – Notch in Terminator

Clavius up close on the surface of the moon

The week of May 25-31 takes us from Day 9 to Day 15. 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 May 25, 2026May 11, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in May, Moon craters No Comments Read more

Maurolycus: Largest, Most Conspicuous Moon Crater in Lunar Highlands

moon crater Maurolycus

The week of May 18-24 takes us from Day 2 to Day 8.  This week we will highlight the moon crater Maurolycus, visible on Sunday night close to the terminator. Maurolycus: [SE/P11; L=14°E] Let us venture briefly into a region

Andrew Planck May 18, 2026May 11, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in May, Moon craters No Comments Read more

Examples of Subsidence on the Moon: Moon Craters Posidonius and le Monnier

Posidonius and le Monnier on the surface of the moon

The week of May 4-10 takes us from Day 18 to Day 24.  This week we will highlight the moon craters Posidonius & le Monnier, visible on Tuesday night close to the terminator. Posidonius/le Monnier: [NE/F-G13; L=30°E] There are only

Andrew Planck May 4, 2026May 4, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in May, Moon craters, Subsidence on the Moon No Comments Read more

Endymion – Older Moon Crater Which Resembles Plato

Endymion and coordinates on the moon

The week of April 13-19 takes us from Day 26 to Day 2.  This week we will highlight the moon crater Endymion, visible on Sunday night close to the terminator. Endymion: [NE/D15; L=57°E] This is an older moon crater which

Andrew Planck April 13, 2026April 8, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April, Moon craters No Comments Read more

Aristoteles – Complex Moon Crater with Terraces

Aristoteles and Eudoxus craters on the moon

The week of March 23-29 takes us from Day 5 to Day 11.  This week we will highlight the moon crater Aristoteles, visible on Wednesday night close to the terminator. Aristoteles: [NE/D11; L=17°E] Close to the terminator this evening there

Andrew Planck March 23, 2026March 18, 2026 complex moon craters, Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in March, Moon craters No Comments Read more

One of the Moon’s Loveliest Sights – Moon Crater Plato

Plato, Alpine Valley and Mare Imbrium on the moon

The week of March 9-15 takes us from Day 21 to Day 27. This week we will highlight the moon crater Plato, visible on Tuesday night close to the terminator. Plato: [NW/D9; L=9°W] Wait until the terminator is a little

Andrew Planck March 9, 2026March 4, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in March, Moon craters No Comments Read more

Moon Crater Endymion Resembles Plato

Moon Crater Endymion Resembles Plato

The week of March 2-8 takes us from Day 14 to Day 19.  This week we will highlight the moon crater Endymion, visible on Tuesday night close to the terminator. Endymion: [Repeated from Day 3–NE/D15; L=57°E] This is an older

Andrew Planck March 2, 2026February 25, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in March, Moon craters No Comments Read more

Maurolycus – Moon Crater in the Lunar Highlands

Maurolycus on the moon

The week of February 23 – March 1 takes us from Day 7 to Day 13. 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

Andrew Planck February 23, 2026February 20, 2026 Craters on the Moon, Lunar Days in February, 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 Moon Crater - June 15, 2026
  • Mare Humorum: “Sea of Moisture” Basin One of Best Examples of Subsidence - June 8, 2026
  • Moon Crater Bailly – Over 3 Billion Years Old - June 1, 2026
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