Andrew Planck

Astronomer, Teacher, Musician

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Author: Andrew Planck

Sinus Iridum – Bay of Rainbows on the Moon

Sinus Iridum – Bay of Rainbows on the Moon

The week of April 7-13 takes us from Lunar Day 10 to Day 16. This week we will highlight Sinus Iridum, visible on Tuesday night close to the terminator. Sinus Iridum: [NW/E6; L=32°W] Sinus Iridum (the Bay of Rainbows), located

Andrew Planck April 7, 2025April 3, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April, Moon craters, Uncategorized No Comments Read more

Moon Crater Taruntius

Moon Crater Taruntius

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

Rima Sirsalis – Small Overlapping Moon Crater

Rima Sirsalis – Small Overlapping Moon Crater

The week of March 24-30 takes us from Lunar Day 25 to Day 2. This week we will highlight the Rima Sirsalis, visible on Tuesday night close to the terminator. Rimae Sirsalis: [SW/L3-4; L=62°W] Just in from the southwest shore

Andrew Planck March 24, 2025March 20, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in March, Moon craters, Rilles on the Moon No Comments Read more

Imposing Trio of Moon Craters

Imposing Trio of Moon Craters

The week of March 17-23 takes us from Lunar Day 18 to Day 24. This week we will highlight the moon craters Theophilus, Cyrillus, and Catharina, visible on Tuesday night close to the terminator. Theophilus, Cyrillus, Catharina: [SE/L12; L=24°E] This

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

Moon Craters Cleomedes and Proclus

Moon Craters Cleomedes and Proclus

The week of March 10-16 takes us from Lunar Day 11 to Day 17. This week we will highlight the moon craters Cleomedes and Proclus visible on Sunday night close to the terminator. Cleomedes: [NE/G15] Cleomedes is the first significant

Andrew Planck March 10, 2025March 6, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in March, Moon craters No Comments Read more

Posidonius and le Monnier – Two Moon Craters on Mare Serenitatis

Posidonius and le Monnier – Two Moon Craters on Mare Serenitatis

The week of March 3-9 takes us from Lunar Day 4 to Day 10. This week we will highlight the moon craters Posidonius and le Monnier visible on Tuesday night. Posidonius/le Monnier: [NE/F-G13; L=30°E] There are only two craters of

Andrew Planck March 3, 2025February 27, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Floor Fractured Moon Craters, Lunar Days in March, Moon craters No Comments Read more

Moon Craters Langrenus & Vendelinus

Moon Craters Langrenus & Vendelinus

The week of February 24 – March 2 takes us from Lunar Day 26 to Day 3. This week we will highlight the moon craters Langrenus & Vendelinus, visible on Sunday night. The Great Eastern Chain: [SE/K-N16; L=61°E] There is

Andrew Planck February 24, 2025February 21, 2025 chain of moon craters, Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in February, Lunar Days in March, Moon craters No Comments Read more

3 Moon Craters Visible Near the Terminator

3 Moon Craters Visible Near the Terminator

The week of February 17-23 takes us from Lunar Day 20 to Day 26. This week we will highlight the moon craters Ptolemaeus, Alphonsus, and Arzachel, visible on Wednesday night near the terminator. Ptolemaeus, Alphonsus, Arzachel: [SW/K-L9; L=3°W] (These may

Andrew Planck February 17, 2025February 14, 2025 chain of moon craters, Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in February, Moon craters No Comments Read more

Cauchy Domes on the Moon

Cauchy Domes on the Moon

The week of February 10-16 takes us from Lunar Day 13 to Day 18. This week we will highlight the Cauchy Domes on the moon, visible on Sunday night near the terminator. Cauchy domes: [NE/J13; L=36°E] During sunrise over this

Andrew Planck February 10, 2025February 7, 2025 Dates to Observe Objects on the Moon, Domes on the Moon, Lunar Days in February No Comments Read more

Apennine Mountain Range – Result of Impact that Created Imbrium Basin on the Moon

Apennine Mountain Range – Result of Impact that Created Imbrium Basin on the Moon

The week of February 3-9 takes us from Lunar Day 5 to Day 12. This week we will highlight the Apennine Mountains on the moon, visible on Thursday night close to the terminator. Montes Apenninus: The Apennine Mountain Range is

Andrew Planck February 3, 2025January 30, 2025 Dates to Observe Objects on the Moon, Lunar Days in February, Mountain Ranges on the Moon 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)
  • Clavius – Moon Crater Strewn with Craterlets - June 16, 2025
  • Furnerius – Southernmost Moon Crater That Makes Up the Great Eastern Chain - June 9, 2025
  • Albategnius – 85 mile Complex Moon Crater - June 2, 2025
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