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Astronomer, Teacher, Musician

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Mars

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

Moon Crater Plato

Plato's original floor is actually 1.5 miles deeper than it appears.

The week of January 26 – February 1 takes us from Day 8 to Day 14. 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

Andrew Planck January 26, 2026January 28, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in January, Moon craters No Comments Read more

Moon Crater Humboldt – Best Viewed with Pronounced Libration

Humboldt

The week of September 22-28 takes us from Day 1 to Day 7. This week we will highlight the moon crater Humboldt, visible on Tuesday night close to the eastern edge. Humboldt1: [SE/M18] This moon crater is best viewed when

Andrew Planck September 22, 2025September 17, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in September No Comments Read more

Cleomedes: First Significant Moon Crater North of Mare Crisium

Cleomedes

The week of September 1-7 takes us from Day 10 to Day 16. This week we will highlight the moon crater Cleomedes, visible on Sunday night. Cleomedes: [NE/G15; L=56°E] Cleomedes is the first significant moon crater just north of Mare

Andrew Planck September 1, 2025August 28, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in September, Moon craters, Rilles on the Moon No Comments Read more

Apennine Mountain Range on the Moon – Most Spectacular Feature

Apennine Mountain Range

The week of August 25-31 takes us from Day 25 to Day 9. This week we will highlight Montes Apenninus, visible on Sunday night close to the terminator. Montes Apenninus: [NW/H9-G10; L=4°W] The Apennine Mountain Range is the most spectacular

Andrew Planck August 25, 2025August 22, 2025 Lunar Days in August, Mountain Ranges on the Moon No Comments Read more

A Graben on the Moon: Rima Ariadaeus

A Graben on the Moon: Rima Ariadaeus

The week of April 28-May 4 takes us from New Moon to Day 7. This week we will highlight Rima Ariadaeus, visible on Sunday night. Rima Ariadaeus: [Repeated from Day 6–NE/J11; L=14°E] The best place to see rilles on the

Andrew Planck April 28, 2025April 5, 2025 Dates to Observe Objects on the Moon, Lunar Days in April, Rilles on the Moon No Comments Read more

Moon Crater Taruntius

small moon crater Cameron

The week of March 31-April 6 takes us from Lunar Day 3 to Day 9. This week we will highlight the moon crater Taruntius, visible on Tuesday night close to the terminator. Taruntius: [NE/J14; L=47°E] Located on the north shore

Andrew Planck March 31, 2025March 27, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Floor Fractured Moon Craters, Lunar Days in April, Lunar Days in March, Simple Moon Craters No Comments Read more

Altai Scarp (Rupes Altai) – How Shock Waves from a Major Impact can Compress the Surrounding Terrain

scarp called Rupes Altai

The week of January 13-19 takes us from Day 14 to Day 20. This week we will highlight Rupes Altai, visible on Saturday night. Altai Scarp (Rupes Altai): [SE/M12] Viewable even through small telescopes, the Altai Scarp is a spectacular

Andrew Planck January 13, 2025January 10, 2025 Lunar Days in January, Mountain Ranges on the Moon No Comments Read more

Trio of Moon Craters, Theophilus, Cyrillus,and Catharina

Theophilus

The week of December 30-Jan 5 takes us from Lunar Day 0 to Day 6. This week we will highlight the trio of moon craters, Theophilus, Cyrillus,and Catharina, visible on Saturday night. Theophilus, Cyrillus, Catharina: [Repeated from Day 5–SE/L12; L=24°E]

Andrew Planck December 30, 2024December 6, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in December, Moon craters No Comments Read more

Lunar X on the Moon: Intersection of the Rims of Blanchinus, La Caille, and Purbach

Lunar X

The week of December 16-22 takes us from Lunar Day 16 to Day 22. This week we will highlight an item informally referred to as the “Lunar X,” visible on Sunday night. Lunar X: [SE/M10; L=1°E] Around 6 days 22

Andrew Planck December 16, 2024December 6, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in December 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)
  • Sea of Crises – First Large Sea to Become Visible on the Waxing Moon - March 16, 2026
  • One of the Moon’s Loveliest Sights – Moon Crater Plato - March 9, 2026
  • Moon Crater Endymion Resembles Plato - March 2, 2026
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