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Andrew Planck

Astronomer, Teacher, Musician

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Andrew Planck

Moon Crater Schickard has Stripes

Moon crater Schickard closer view on the surface of the moon

The week of May 11-17 takes us from Day 25 to Day 1.  This week we will highlight the moon crater Schickard, visible on Tuesday night close to the terminator. Schickard: [SW/P4; L=55°W] When you look at Schickard, you should

Andrew Planck May 11, 2026May 7, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in May 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 – Moon Crater

Endymion crater from above the moon

The week of April 27 – May 3 takes us from Day 10 to Day 17. This week we will highlight the moon crater Endymion, visible on Saturday night close to the terminator. Endymion: [NE/D15; L=57°E] This is an older

Andrew Planck April 27, 2026April 21, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April No Comments Read more

Aristoteles Adjoins the Moon Crater Mitchell

Aristoteles Adjoins the Moon Crater Mitchell

The week of April 6 – April 12 takes us from Day 19 to Day 20. This week we will highlight the moon crater Eudoxus, visible on Tuesday night close to the terminator. Aristoteles: [NE/D11; L=17°E] Close to the terminator

Andrew Planck April 6, 2026April 1, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April No Comments Read more

East of Lacus Mortis on the Moon: Hercules and Atlas

Hercules and Atlas craters on the moon

The week of March 30 – April 5 takes us from Day 12 to Day 18.  This week we will highlight the moon craters Hercules & Atlas, visible on Saturday night close to the terminator. Hercules and Atlas: [NE/E13-14; L=39°E]

Andrew Planck March 30, 2026March 24, 2026 Craters on the Moon, Floor Fractured Moon Craters, Lunar Days in March 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

Sea of Crises – First Large Sea to Become Visible on the Waxing Moon

Mare Crisium Day 4

The week of March 16-22 takes us from Day 28 to Day 4.  This week we will highlight the Sea of Crises, visible on Sunday night close to the terminator. Mare Crisium: [NE/H15; L=59°E] On Day 3 the Sea of

Andrew Planck March 16, 2026March 12, 2026 "Seas" on the Moon, Dates to Observe Objects on the Moon, Lunar Days in March 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)
  • Moon Crater Schickard has Stripes - May 11, 2026
  • Examples of Subsidence on the Moon: Moon Craters Posidonius and le Monnier - May 4, 2026
  • Endymion – Moon Crater - April 27, 2026
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