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Andrew Planck

Astronomer, Teacher, Musician

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Month: May 2023

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

Sulpicius Gallus Rilles on the Moon

Sulpicius Gallus Rilles

The week of May 22-28 takes us from Day 3 to Day 9. This week we will highlight the Sulpicius Gallus rilles on the moon, viewable on Friday evening. Sulpicius Gallus Rilles: [NE/G10-11; L=10°E] These rilles, located on the south-western

Andrew Planck May 22, 2023May 17, 2023 Lunar Days in May, Mars, Rilles on the Moon, Venus No Comments Read more

Moon Crater Wargentin: Unique Wrinkle Ridge Pattern

moon crater Wargentin

The week of May 15-21 takes us from Day 26 to Day 2. This week we will highlight the moon crater Wargentin, viewable early Sunday morning. Wargentin: [L=60°W] This is one of the more unusual craters on the Moon. When

Andrew Planck May 15, 2023May 10, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in May, Moon craters, Wrinkle Ridge on the moon No Comments Read more

Two of the Best-Known Faults on the Moon

Rupes Cauchy crater on the moon

The week of May 8-14 takes us from Day 18 to Day 24. This week we will highlight Rupes Cauchy, a fault on the moon, viewable on Tuesday before sunrise. Rupes Cauchy: [NE/J13; L=37°E] Two of the best-known faults on

Andrew Planck May 8, 2023April 22, 2023 Dates to Observe Objects on the Moon, Faults on the Moon, Lunar Days in May, Rilles on the Moon, Saturn No Comments Read more

Moon Crater Schickard – Floor has Stripes

crater Schickard on the moon has stripes

The week of May 1-7 takes us from Day 11 to Day 17. This week we will highlight the moon crater Schickard, viewable on Tuesday night and located in the SW quadrant of the Field Map. Schickard: [SW/P4; L=55°W] When

Andrew Planck May 1, 2023May 1, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in May, Meteor Shower, Moon craters, 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
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