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Astronomer, Teacher, Musician

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Month: April 2022

Moon Crater Kepler: Rays Intertwine with Copernicus and Aristarchus

moon crater Kepler

The week of April 25 – May 1st takes us from Day 25 to Day 1. This week we will highlight the moon crater Kepler, viewable before sunrise on Tuesday. Kepler1: [NW/J6; L=38°W] Kepler is a substantial 20-mile crater with

Andrew Planck April 25, 2022April 24, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April, Unusual Features on the Moon 1 Comment Read more

The Most Imposing Trio of Craters on the Moon: Theophilus, Cyrillus, and Catharina

Theophilus, Cyrillus, Catharina moon craters

The week of April 18-24 takes us from Day 17 to Day 24. This week we will highlight the craters Theophilus, Cyrillus, and Catharina, viewable on Tuesday night. Theophilus, Cyrillus, Catharina: [SE/L12] This is the most imposing trio of craters

Andrew Planck April 18, 2022April 18, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April No Comments Read more

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

Mare Humorum on the moon

The week of April 11-17 takes us from Day 10 to Day 16. This week we will highlight Mare Humorum on the moon, viewable on Tuesday evening. Mare Humorum: [SW/M6] The Humorum basin is one of the best examples of

Andrew Planck April 11, 2022April 11, 2022 Dates to Observe Objects on the Moon, Lunar Days in April, Subsidence on the Moon No Comments Read more

Triesnecker Rilles on the Moon: A Complex System Resembling a Railway Switchyard

Triesnecker rilles on the moon

The week of April 4-10 takes us from Day 4 to Day 9. This week we will highlight the Triesnecker rilles on the moon and an object informally known as the “Lunar X.” Triesnecker Rilles: [NE/J10] What a great place

Andrew Planck April 4, 2022April 3, 2022 Dates to Observe Objects on the Moon, Lunar Days in April, Rilles on the Moon, 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)
  • One of the Moon’s Loveliest Sights – Moon Crater Plato - March 9, 2026
  • Moon Crater Endymion Resembles Plato - March 2, 2026
  • Maurolycus – Moon Crater in the Lunar Highlands - February 23, 2026
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