Andrew Planck

Astronomer, Teacher, Musician

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Rima Ariadaeus

A Graben on the Moon: Rima Ariadaeus

A Graben on the Moon: Rima Ariadaeus

The week of April 28-May 4 takes us from New Moon to Day 7. This week we will highlight Rima Ariadaeus, visible on Sunday night. Rima Ariadaeus: [Repeated from Day 6–NE/J11; L=14°E] The best place to see rilles on the

Andrew Planck April 28, 2025April 5, 2025 Dates to Observe Objects on the Moon, Lunar Days in April, Rilles on the Moon No Comments Read more

The Best Place to see Rilles on the Moon

The Best Place to see Rilles on the Moon

The week of June 24-30 takes us from Lunar Day 19 to Day 25. This week we will highlight Rima Ariadaeus, located near the western edge of Mare Tranquillitatis in the NE quadrant of the Field Map at J11. It

Andrew Planck June 24, 2024June 21, 2024 Dates to Observe Objects on the Moon, Lunar Days in June, Rilles on the Moon No Comments Read more

Rima Ariadaeus is a Classic Example of a Graben on the Moon

Rima Ariadaeus is a Classic Example of a Graben on the Moon

The week of May 27 – June 2 takes us from Day 20 to Day 26. This week we will highlight Rima Ariadaeus, viewable close to the terminator on Sunday evening, June 2, Day 26 and located in the NE

Andrew Planck May 27, 2024May 24, 2024 Lunar Days in May, Rilles on the Moon No Comments Read more

Rima Hyginus (Hyginus Rille) on the Moon

Rima Hyginus (Hyginus Rille) on the Moon

The week of November 27 – December 3 takes us from Day 16 to Day 21. This week we will highlight Rima Hyginus (the Hyginus rille) on the moon, viewable on Saturday night around 11:00 and located in the NE

Andrew Planck November 27, 2023November 6, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in November, Mars, Rilles on the Moon No Comments Read more

Rima Hyginus: A Line of Linked Moon Craters

Rima Hyginus: A Line of Linked Moon Craters

The week of September 4 – September 10 takes us from Day 20 to Day 26. This week we will highlight Rima Hyginus, viewable on Tuesday before midnight. Rima Hyginus: [NE/J10; L=8°E] At the west end of the Ariadaeus rille,

Andrew Planck September 4, 2023August 31, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in September, Rilles on the Moon No Comments Read more

Rima Ariadaeus – Rille on the Moon that is a Graben

Rima Ariadaeus – Rille on the Moon that is a Graben

The week of August 21-27 takes us from Day 5 to Day 11. This week we will highlight Rima Ariadaeus on the moon, viewable Tuesday night. Rima Ariadaeus: NE/J11; L=14°E] The best place to see rilles on the Moon is

Andrew Planck August 21, 2023September 11, 2023 Dates to Observe Objects on the Moon, Lunar Days in August, Rilles on the Moon No Comments Read more

Rima Ariadaeus – Example of a Graben on the Moon

Rima Ariadaeus – Example of a Graben on the Moon

The week of June 19-25 takes us from Day 2 to Day 7. This week we will highlight Rima Ariadaeus, located in the NE quadrant of the Field Map at J11. Rima Ariadaeus: [NE/J11; L=14°E] The best place to see

Andrew Planck June 19, 2023June 19, 2023 Dates to Observe Objects on the Moon, Lunar Days in June, Rilles on the Moon No Comments Read more

Moon Crater Rima Hyginus: Located at a Pivot Point

Moon Crater Rima Hyginus: Located at a Pivot Point

The week of February 7-13 takes us from Day 7 to Day 12. This week we will highlight Rima Hyginus and Rima Ariadaeus, located in the NE quadrant at J10 & J11 on your field map. Rima Hyginus: [NE/J10; L=8°E]

Andrew Planck February 7, 2022February 7, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in February, Rilles 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)
  • Bailly – Largest Crater on Our Side of the Moon - January 12, 2026
  • Longomontanus: Exception to the Rule About Moon Crater Age - January 5, 2026
  • Schickard: Terrain Made Up of Two Different Chemical Compositions - December 29, 2025
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