Andrew Planck

Astronomer, Teacher, Musician

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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

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 Brightest Comet this Year and an Admirable Moon Crater

The Brightest Comet this Year and an Admirable Moon Crater

The week of December 3-9 takes us from Day 26 to Day 2. Tuesday morning around 4:00 a.m. will be the only practical opportunity to view the Moon. This week we will highlight the crater Seleucus and Comet 46/P Wirtanen.

Andrew Planck December 3, 2018December 3, 2018 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in December No Comments Read more

Full Moon to Lunar Day 20: Impressive Cape, Crater Chain and Comet Lovejoy

Full Moon to Lunar Day 20: Impressive Cape, Crater Chain and Comet Lovejoy

The week of April 10 – 16 takes us from lunar Day 14, full moon, to Day 20. This week we will highlight the crater Humboldt on Tuesday evening (you might try Monday to see if there’s enough contrast), and

Andrew Planck April 10, 2017April 9, 2017 Craters on the Moon, Lunar Days in April 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 Maurolycus Displays a Rich Diversity of Different Types of Features - December 8, 2025
  • Humboldt: Moon Crater with Cluster of Central Peaks - December 1, 2025
  • 3 Moon Craters West of Mare Nectaris - November 24, 2025
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