Andrew Planck

Astronomer, Teacher, Musician

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crater chain

Moon Crater Humboldt – Best Viewed with Pronounced Libration

Moon Crater Humboldt – Best Viewed with Pronounced Libration

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

Moon Crater Humboldt

Moon Crater Humboldt

The week of July 21-27 takes us from Day 27 to Day 3. This week we will highlight the moon crater Humboldt, visible on Saturday night close to the terminator. Humboldt:1 [SE/M18] This moon crater is best viewed when there

Andrew Planck July 21, 2025July 17, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in July, Moon craters 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

The Great Eastern Chain: Series of Moon Craters

The Great Eastern Chain: Series of Moon Craters

The week of July 25-31 takes us from Day 27 to Day 3. This week we will highlight a series of craters called the Great Eastern Chain. The Great Eastern Chain: [SE/K-N16; L=61°E] There is a conspicuous chain of large

Andrew Planck July 25, 2022July 25, 2022 chain of moon craters, Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in July, Rilles on the Moon No Comments Read more

Catena Abulfeda: Chain of Moon Craters

Catena Abulfeda: Chain of Moon Craters

This week we will highlight the moon crater Abulfeda, viewable early Tuesday morning on Day 21. It is a lunar impact crater located in the central highlands of the Moon. To the northeast is the moon crater Descartes. A chain

Andrew Planck July 18, 2022July 18, 2022 chain of moon craters, Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in July No Comments Read more

Crater Chain on the Moon – Catena Davy

Crater Chain on the Moon – Catena Davy

The week of June 6-12 takes us from Day 7 to Day 13. This week we will highlight the crater chain known as Catena Davy. Catena Davy: [SW/L9; L=7°W] This fascinating crater chain was made when a comet or asteroid

Andrew Planck June 6, 2022June 5, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in June No Comments Read more

Moon Crater Humboldt: Cluster of Central Peaks and Crater Chain

Moon Crater Humboldt: Cluster of Central Peaks and Crater Chain

The week of March 28 – April 3rd takes us from Day 26 to Day 3. This week we will highlight the moon crater Humboldt. Humboldt1: [SE/M18] This moon crater is best viewed when there is a pronounced libration; tonight

Andrew Planck March 28, 2022March 27, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in March No Comments Read more

Humboldt: Moon Crater Best Viewed When There is a Pronounced Libration

Humboldt: Moon Crater Best Viewed When There is a Pronounced Libration

The week of October 12-18 takes us from Lunar Day 25 to Day 2. For the first part of the week, you’ll have to be up pretty early to see the Moon. On Tuesday, it rises at 3:04 AM; on

Andrew Planck October 12, 2020October 11, 2020 Craters on the Moon, Lunar Days in October, Uncategorized No Comments Read more

The Great Eastern Chain: Conspicuous Chain of Large Craters on the Moon

The Great Eastern Chain: Conspicuous Chain of Large Craters on the Moon

The week of August 3-9 takes us from Lunar Day 15 (Full Moon) to Day 28. This week we will highlight a feature called The Great Eastern Chain, viewable on Wednesday, Day 17. The Great Eastern Chain: [SE/K-N16] There is

Andrew Planck August 3, 2020August 2, 2020 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in August, Unusual Features on the Moon No Comments Read more

The Great Eastern Chain on the Moon

The week of October 14-20 takes us from Day 15 to 21. This week we will highlight a feature commonly referred to as The Great Eastern Chain, viewable on Monday evening. The Great Eastern Chain: [SE/K-N16] There is a conspicuous

Andrew Planck October 14, 2019October 13, 2019 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in October, Rilles 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)
  • Moon Crater Aristoteles, Close to the Terminator - November 10, 2025
  • Complex Moon Crater Pythagoras - November 3, 2025
  • Theophilus, Cyrillus, Catharina Moon Craters West of Mare Nectaris - October 27, 2025
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