Andrew Planck

Astronomer, Teacher, Musician

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Nectaris Basin

Furnerius – Southernmost Moon Crater That Makes Up the Great Eastern Chain

Furnerius – Southernmost Moon Crater That Makes Up the Great Eastern Chain

The week of June 9-15 takes us from Day 14 to Day 20. This week we will highlight the moon crater Furnerius, visible on Wednesday night and also Thursday night close to the terminator. Furnerius: [SE/N16; L=61°E] This is the

Andrew Planck June 9, 2025June 5, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in June, Moon craters No Comments Read more

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

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

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

Mare Nectaris – Multi-Ring Basin on the Moon

Mare Nectaris – Multi-Ring Basin on the Moon

The week of September 2-8 takes us from Day 29 to Day 6. This week we will highlight Mare Nectaris, located in the SE quadrant of the Field Map at L13 and viewable on Saturday and Sunday nights. Mare Nectaris:

Andrew Planck September 2, 2024August 22, 2024 Lunar Days in September, Moon Basin No Comments Read more

Rupes Altai: Scarp on the Moon

Rupes Altai: Scarp on the Moon

The week of October 2-8 takes us from Day 19 to Day 25. This week we will highlight a scarp on the moon called Rupes Altai, visible after 10:00pm on Tuesday. Altai Scarp (Rupes Altai): [SE/M12] Viewable even through small

Andrew Planck October 2, 2023October 2, 2023 Dates to Observe Objects on the Moon, Lunar Days in October, Multi-ring basin on the moon 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

Moon Craters Piccolomini and Altai Scarp

Moon Craters Piccolomini and Altai Scarp

The week of November 30 – December 6 takes us from Lunar Day 15 to Day 21. This week we will highlight the crater Piccolomini and the Altai Scarp, viewable on Friday evening, Day 19. Altai Scarp (Rupes Altai): [SE/M12]

Andrew Planck November 30, 2020November 27, 2020 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in November, Multi-ring basin 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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