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Astronomer, Teacher, Musician

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Month: December 2021

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 Proclus: One of the Brightest Spots on the Moon

Proclus is a small crater located just west of Mare Crisium

The week of December 20-26 takes us from Day 17 to Day 21. This week we will highlight the crater Proclus located in the NE quadrant of the Field Map at H14, the Ursid meteor shower, and the Winter Solstice.

Andrew Planck December 20, 2021December 20, 2021 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in December No Comments Read more

Sinus Iridum on the Moon: The Bay of Rainbows

Jura Mountains on the rim of Sinus Iridum on the moon

The week of December 13-19 takes us from Day 10 to Day 16. This week we will highlight Sinus Iridum, located in the northwest sector of Mare Imbrium. Sinus Iridum: [NW/E6] Sinus Iridum (the Bay of Rainbows) formed after the

Andrew Planck December 13, 2021December 12, 2021 Lunar Days in December, Subsidence on the Moon No Comments Read more

Rheita Valley – Longest Distinct Valley on the Moon

Rheita Valley is the longest distinct valley on the Moon

The week of December 6-12 takes us from Day 3 to Day 9. This week we will highlight Vallis Rheita, viewable on Tuesday & Wednesday evening, Days 4 and 5. Vallis Rheita: [SE/N14; L=52°E] At 276 miles, the Rheita Valley

Andrew Planck December 6, 2021December 5, 2021 Unusual Features on the Moon, Valleys 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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