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Andrew Planck

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Mare Humorum

Moon Crater Hippalus: Finest Examples of Arcuate Rilles

Hippalus Rilles

The week of May 29 – June 4 takes us from Day 10 to Day 16. This week we will highlight the Hippalus rilles, viewable on Tuesday evening. Rimae Hippalus: [SW/M6; L=29°W] On the east shore of Mare Humorum you

Andrew Planck May 29, 2023May 20, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in May, Rilles on the Moon No Comments Read more

Moon Crater Hippalus – Finest Examples of Arcuate Rilles

Hippalus Rilles on the moon example of arcuate rille

This week we will highlight the Hippalus rilles on the moon, viewable early Wednesday morning, and the Leonid meteor shower. Rimae Hippalus: [SW/M6] On the east shore of Mare Humorum, you will find the remnant of the moon crater Hippalus,

Andrew Planck November 14, 2022November 9, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in November, Rilles on the Moon No Comments Read more

Hippalus Rilles on the Moon

Mare Humorum you will find the remnant of the crater Hippalus

The week of December 27 – January 2 takes us from Day 23 to New Moon. This week we will highlight the Hippalus Rilles located in the SW quadrant of the Field Map at M6 and viewable on Tuesday morning.

Andrew Planck December 27, 2021December 23, 2021 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in December, Rilles on the Moon No Comments Read more

Moon Crater Gassendi: Three Generations of Crater Age

Gassendi moon crater

The week of July 5-11 takes us from Lunar Day 25 to Day 2. This week we will highlight the crater Gassendi, viewable early Monday morning. Gassendi: [SW/L5; L=40°W] Three generations of crater age can be easily observed on Mare

Andrew Planck July 5, 2021July 5, 2021 Craters on the Moon, Lunar Days in July, 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)
  • Endymion – Older Moon Crater Which Resembles Plato - April 13, 2026
  • Aristoteles Adjoins the Moon Crater Mitchell - April 6, 2026
  • East of Lacus Mortis on the Moon: Hercules and Atlas - March 30, 2026
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