Andrew Planck

Astronomer, Teacher, Musician

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chain of moon craters

Clavius – Moon Crater Strewn with Craterlets

Clavius – Moon Crater Strewn with Craterlets

The week of June 16-22 takes us from Day 21 to Day 27. This week we will highlight the moon crater Clavius, visible on Tuesday night close to the terminator. Clavius: [SW/Q8] Sunset over Clavius is something that you don’t

Andrew Planck June 16, 2025June 14, 2025 Celestial Events, chain of moon craters, Craters on the Moon, Night Sky Observations, Saturn 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

Rimae Sirsalis: Two Small Overlapping Moon Craters – Sirsalis and Sirsalis A

The week of December 23-29 takes us from Lunar Day 23 to Day 29. This week we will highlight a feature called Rimae Sirsalis, visible on Thursday night. Rimae Sirsalis: [SW/L3-4; L=62°W] Just in from the southwest shore of Oceanus

Andrew Planck December 23, 2024December 6, 2024 chain of moon craters, Lunar Days in December, Rilles on the Moon No Comments Read more

Moon Crater Rima Hyginus – Line of Linked Craters

Moon Crater Rima Hyginus – Line of Linked Craters

The week of December 2 – December 8 takes us from Lunar Day 2 to Day 8. This week we will highlight Rima Hyginus, visible on Saturday night. Rima Hyginus: [NE/J10; L=8°E] At the west end of the Ariadaeus rille,

Andrew Planck December 2, 2024November 21, 2024 chain of moon craters, Craters on the Moon, Lunar Days in December, Moon craters, Rilles on the Moon No Comments Read more

Moon Crater Humboldt – Cluster of Central Peaks

Moon Crater Humboldt – Cluster of Central Peaks

The week of November 25 – December 1 takes us from Lunar Day 24 to Day 1. This week we will highlight the moon crater Humboldt, visible on Sunday night. Humboldt:1 [SE/M18] This moon crater is best viewed when there

Andrew Planck November 25, 2024November 21, 2024 chain of moon craters, Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in November, Moon craters No Comments Read more

Furnerius: Southernmost of the Moon Craters that Make Up the Great Eastern Chain

Furnerius: Southernmost of the Moon Craters that Make Up the Great Eastern Chain

The week of November 11-17 takes us from Lunar Day 11 to Day 17. This week we will highlight the moon crater Furnerius, visible on Sunday night. Furnerius: [SE/N16; L=61°E] This is the southernmost of the moon craters that make

Andrew Planck November 11, 2024November 7, 2024 chain of moon craters, Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in November, Moon craters No Comments Read more

First Two Segments of Chain of Large Moon Craters: Langrenus and Vandelinus

First Two Segments of Chain of Large Moon Craters: Langrenus and Vandelinus

The week of October 28 – November 3 takes us from Lunar Day 26 to Day 3. This week we will highlight the moon craters Langrenus and Vandelinus, visible on Sunday night. The Great Eastern Chain: [SE/K-N16; L=61°E] There is

Andrew Planck October 28, 2024October 25, 2024 chain of moon craters, Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in October, Moon craters No Comments Read more

Trio of Moon Craters with Distinct Personalities

Trio of Moon Craters with Distinct Personalities

The week of April 22-28 takes us from Day 14 to Day 19. This week we will highlight the moon craters Theophilus, Cyrillus, and Catharina viewable on Sunday morning before sunrise and located in the SE quadrant of the Field

Andrew Planck April 22, 2024April 18, 2024 chain of moon craters, Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April, Moon craters No Comments Read more

Catena Davy – Fascinating Moon Crater Chain

Catena Davy – Fascinating Moon Crater Chain

The week of January 1-7 takes us from Day 21 to Day 26. This week we will highlight the Catena Davy viewable on Tuesday night and found in the SW quadrant of the Field Map. Catena Davy: [SW/L9; L=7°W] This

Andrew Planck January 1, 2024December 17, 2023 chain of moon craters, Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in January, 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)
  • 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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