Andrew Planck

Astronomer, Teacher, Musician

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subsidence on the Moon

3 Moon Craters: Mare Nectaris, Fracastorius and Rupes Altai

3 Moon Craters: Mare Nectaris, Fracastorius and Rupes Altai

The week of January 13-19 takes us from Day 18 to Day 24. This week we will highlight Mare Nectaris and the crater Fracastorius, viewable late Monday night, and Rupes Altai (the Altai Scarp) viewable Tuesday evening. Mare Nectaris: [SE/L13]

Andrew Planck January 13, 2020 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in January No Comments Read more

Mare Humorum: One of the Best Examples of Subsidence on the Moon

Mare Humorum: One of the Best Examples of Subsidence on the Moon

The week of January 6-12 takes us from Day 11 to Day 17. This week we will highlight Mare Humorum, viewable for the whole week beginning on Monday evening. Mare Humorum: [SW/M6] The Humorum basin is one of the best

Andrew Planck January 6, 2020January 6, 2020 Dates to Observe Objects on the Moon, Jupiter, Lunar Days in January 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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