Andrew Planck

Astronomer, Teacher, Musician

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Saturn

Clavius – Moon Crater Strewn with Craterlets

Clavius – Moon Crater Strewn with Craterlets

The week of June 16-22 takes us from Day 21 to Day 27. This week we will highlight the moon crater Clavius, visible on Tuesday night close to the terminator. Clavius: [SW/Q8] Sunset over Clavius is something that you don’t

Andrew Planck June 16, 2025June 14, 2025 Celestial Events, chain of moon craters, Craters on the Moon, Night Sky Observations, Saturn No Comments Read more

Two of the Best-Known Faults on the Moon

Two of the Best-Known Faults 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

Craters in the Fra Mauro Region: Critical to Understanding an Important Process that Shaped the Moon

Craters in the Fra Mauro Region: Critical to Understanding an Important Process that Shaped the Moon

The week of April 10-16 takes us from Day 20 to Day 26. This week we will highlight moon craters in the Fra Mauro region, located in the SW quadrant of the Field Map at K8, and viewable early Thursday

Andrew Planck April 10, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April, Rilles on the Moon, Saturn No Comments Read more

Montes Recti and the Collapse of the Arecibo Radio Telescope

Montes Recti and the Collapse of the Arecibo Radio Telescope

The week of December 7-13 takes us from Lunar Day 22 to Day 29. This week we will highlight Montes Recti, the Straight Range, viewable early Tuesday morning, and the collapse of the Arecibo radio telescope. The Straight Range is

Andrew Planck December 7, 2020December 6, 2020 Dates to Observe Objects on the Moon, Jupiter, Lunar Days in December, Radio Telescope, Saturn No Comments Read more

Rheita Valley: The Longest Distinct Valley on the Moon

Rheita Valley: The Longest Distinct Valley on the Moon

The week of March 23-29 takes us from Lunar Day 29 to Day 5. This week we will highlight the Rheita Valley, viewable in the evening on Saturday, March 28. Vallis Rheita: [SE/N14] At 276 miles, the Rheita Valley is

Andrew Planck March 23, 2020March 24, 2020 Dates to Observe Objects on the Moon, Lunar Days in March, Saturn, Valleys on the Moon No Comments Read more

Largest dome on the Moon: Valentine Dome

Largest dome on the Moon: Valentine Dome

The week of September 2-8 takes us from Day 4 to Day 10. This week we will highlight the Valentine Dome, viewable on Thursday evening. Valentine Dome: [NE/F11] Keep a close eye on the movement of the terminator, and when

Andrew Planck September 2, 2019September 2, 2019 Dates to Observe Objects on the Moon, Domes on the Moon, Jupiter, Lunar Days in September, Saturn, Volcanic Dome No Comments Read more

Arago Domes

Arago Domes

The week of August 5-11  takes us from Day 5 to Day 11. This week we will highlight the Arago domes viewable on Tuesday night. Arago domes: [NE/J12] Near the crater Arago there is a pair of very large domes,

Andrew Planck August 5, 2019August 5, 2019 Dates to Observe Objects on the Moon, Domes on the Moon, Jupiter, Lunar Days in August, Mercury, Saturn No Comments Read more

Moon Crater Messier: Pair of Splash Rays that Resemble the Tails of a Comet

Moon Crater Messier: Pair of Splash Rays that Resemble the Tails of a Comet

The week of Nov. 5-11 takes us from Day 28 (almost New Moon) to Day 4. This week we will highlight the crater Messier, viewable on Sunday during deep twilight (catch it before the Moon gets too low). Messier1: [SE/K14]

Andrew Planck November 5, 2018November 5, 2018 Craters on the Moon, Dates to Observe Objects on the Moon, Jupiter, Lunar Days in November, Saturn No Comments Read more

Complex of Domes and Lunar Swirls on the Moon

Complex of Domes and Lunar Swirls on the Moon

The week of June 25 – July 1 takes us from the end of Day 12, close to full moon, to Day 18. This week we will highlight Mons Rümker, viewable Monday, and the lunar swirl Reiner Gamma viewable all

Andrew Planck June 25, 2018June 25, 2018 Dates to Observe Objects on the Moon, Domes on the Moon, Lunar Days in June, Lunar Swirls, Saturn, Unusual Features on the Moon No Comments Read more

Concentric #MoonCraters and Endymion and Geminus

Concentric #MoonCraters and Endymion and Geminus

The week of April 2-8 takes us from Day 17 through Day 22, the beginning of the last quarter. This week we will highlight the craters Endymion and Geminus, viewable around midnight on Monday. Endymion: [NE/D15] This is an older

Andrew Planck April 2, 2018April 2, 2018 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April, Lunar Observers, Mars, Saturn 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 Janssen Located 85 miles Southwest of the Rheita Valley - July 7, 2025
  • Albategnius – How to Observe This Stunning Moon Crater Near the Terminator - June 30, 2025
  • Vallis Rheita: The Moon’s Longest Valley and a Stunning Lunar Observation Target This Week - June 23, 2025
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