Andrew Planck

Astronomer, Teacher, Musician

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Perseid meteor shower

Moon Crater Bullialdus: Most Conspicuous Crater on Mare Nubium

Moon Crater Bullialdus: Most Conspicuous Crater on Mare Nubium

The week of August 10-16 takes us from Lunar Day 22 to Day 27. This week we will highlight the crater Bullialdus, visible on Wednesday morning, and the Perseid meteor shower. Bullialdus: If you recall what Tycho looked like yesterday

Andrew Planck August 10, 2020August 10, 2020 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in August, Meteor Shower No Comments Read more

Shock Waves Frozen in Place on the Moon and A Large, Degraded Crater

Shock Waves Frozen in Place on the Moon and A Large, Degraded Crater

The week of August 13-19 takes us from Day 3 to the end of Day 8. This week we will highlight the Altai Scarp, viewable Friday evening (possibly Thursday) and the crater Hipparchus, viewable on Saturday evening. Altai Scarp (Rupes

Andrew Planck August 13, 2018August 13, 2018 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in August, Unusual Features 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 Cassini – Created on Imbrium floor Before Lavas Started to Flow - January 19, 2026
  • Bailly – Largest Crater on Our Side of the Moon - January 12, 2026
  • Longomontanus: Exception to the Rule About Moon Crater Age - January 5, 2026
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