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Andrew Planck

Astronomer, Teacher, Musician

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Venus

Rimae Sirsalis – Series of Rilles on the Moon

Rimae Sirsalis on the moon

The week of October 9-15 takes us from Day 25 to Day 1. This week we will highlight a series of rilles called Rimae Sirsalis, located in the SW quadrant of the Field Map and viewable on Tuesday morning before

Andrew Planck October 9, 2023October 6, 2023 Dates to Observe Objects on the Moon, Lunar Days in October, Rilles on the Moon No Comments Read more

Enigma of the Moon – Triesnecker Rilles

Triesnecker Rilles on the moon

The week of September 18-24 takes us from Day 27 to Day 10. This week we will highlight the Triesnecker Rilles, an enigma located on the moon in the NE quadrant of the Field Map at J10 and viewable on

Andrew Planck September 18, 2023September 15, 2023 Dates to Observe Objects on the Moon, Lunar Days in September, 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

Linné – Simple Moon Crater that Disappeared

Linne is a young moon crater

The week of March 27-April 2 takes us from Day 29 to Day 6 This week we will highlight the moon crater Linné, located in the NE quadrant of the Field Map at G11 and viewable on Tuesday night. Linné:

Andrew Planck March 27, 2023March 27, 2023 Lunar Days in March, Moon craters, Simple Moon Craters No Comments Read more

One of the Moon’s Best Examples of Subsidence: Moon Crater Fracastorius

moon crater Fracastorius best example of subsidence

The week of March 20-26 takes us from Day 29 to Day 6 This week we will highlight the moon crater Fracastorius, located in the SE quadrant of the Field Map and viewable on Sunday night. Fracastorius: [SE/M13; L=33°E] Located

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

Bullialdus: The Most Conspicuous Moon Crater on Mare Nubium

Bullialdus and Bullialdus A on the moon

The week of February 27 – March 5 takes us from Lunar Day 8 to Day 14. This week we will highlight the moon crater Bullialdus, located in the SW quadrant of the Field Map and viewable on Wednesday night.

Andrew Planck February 27, 2023February 26, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in February No Comments Read more

Rima Ariadaeus – Ariadaeus Rille

Rima Ariadaeus

The week of February 20-26 takes us from Lunar Day 1 to Day 7. This week we will highlight Rima Ariadaeus, located in the NE quadrant of the Field Map and viewable on Sunday night. Ariadaeus: [NE/J11; L=17°E] The Ariadaeus

Andrew Planck February 20, 2023February 18, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in February, Moon craters, Rilles on the Moon, Venus No Comments Read more

Longomontanus is Exception to the Rule Regarding Moon Craters

Longomontanus moon crater

The week of February 13-19 takes us from Lunar Day 22 to Day 29. This week we will highlight the moon crater Longomontanus, located in the SW quadrant of the Field Map and viewable on Tuesday night. Longomontanus: [SW/P7; L=22°W]

Andrew Planck February 13, 2023February 12, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in February, Moon craters No Comments Read more

Rupes Recta and Rupes Cauchy: Two of the Best-Known Faults on the Moon

Rupes Cauchy and Rima Cauchy on the moon

The week of December 26 – January 1 takes us from Lunar Day 4 to Day 10. This week we will highlight the fault Rupes Cauchy located on the moon in the NE quadrant of the Field Map and viewable

Andrew Planck December 26, 2022December 20, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Faults on the Moon, Lunar Days in December, Rilles on the Moon No Comments Read more

Moon Crater Schickard Has Unusual Feature

moon crater Schickard

The week of September 19-25 takes us from Lunar Day 24 to New Moon. This week we will highlight the moon crater Schickard, viewable early Tuesday and Wednesday mornings, and Jupiter and Saturn, viewable throughout the week. Schickard: [SW/P4] When

Andrew Planck September 19, 2022September 19, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in September, 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)
  • Moon Crater Schickard has Stripes - May 11, 2026
  • Examples of Subsidence on the Moon: Moon Craters Posidonius and le Monnier - May 4, 2026
  • Endymion – Moon Crater - April 27, 2026
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