Andrew Planck

Astronomer, Teacher, Musician

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Rheita Valley

The Longest Distinct Valley on the Moon – Rheita Valley

The Longest Distinct Valley on the Moon – Rheita Valley

The week of July 28 – August 3 takes us from Day 4 to Day 10. This week we will highlight the Rheita Valley on the moon, visible on Tuesday night close to the terminator. Vallis Rheita: [SE/N14; L=52°E] At

Andrew Planck July 28, 2025July 28, 2025 Lunar Days in August, Lunar Days in July, Moon craters, Valleys on the Moon No Comments Read more

Vallis Rheita on the Moon

Vallis Rheita on the Moon

The week of August 19-25 takes us from Day 15 to Day 21. This week we will highlight Vallis Rheita, located in the SE quadrant of the Field Map at N14 and viewable on Wednesday night. Vallis Rheita: [SE/N14; L=52°E]

Andrew Planck August 19, 2024August 16, 2024 Lunar Days in August, Valleys on the Moon No Comments Read more

Rheita Valley – Series of Interlocking Moon Craters

Rheita Valley – Series of Interlocking Moon Craters

The week of June 10-16 takes us from Day 5 to Day 10. This week we will highlight Vallis Rheita, located in the SE quadrant of the Field Map at N14 and viewable on Tuesday night. Vallis Rheita: [SE/N14; L=52°E]

Andrew Planck June 10, 2024June 7, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in June No Comments Read more

Moon Crater Janssen: How New Moon Craters are Superimposed on Top of Older Craters

Moon Crater Janssen: How New Moon Craters are Superimposed on Top of Older Craters

The week of April 8-14 takes us from Day 29 to Day 6. This week we will highlight the moon crater Janssen, located in the SE quadrant of the Field Map at P13. Janssen: [SE/P13; L=40°E] Janssen is located 85

Andrew Planck April 8, 2024March 22, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April, Rilles on the Moon No Comments Read more

Vallis Rheita: Series of Interlocking Moon Craters

Vallis Rheita: Series of Interlocking Moon Craters

The week of February 6-12 takes us from Lunar Day 16 to Day 21. This week we will highlight Vallis Rheita, located in the SE quadrant of the Field Map and viewable on Tuesday night. Vallis Rheita: [SE/N14; L=52°E] At

Andrew Planck February 6, 2023February 6, 2023 chain of moon craters, Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in February No Comments Read more

Moon Crater Janssen versus Copernicus, Queen of Moon Craters

Moon Crater Janssen versus Copernicus, Queen of Moon Craters

The week of September 26 – October 2 takes us from Lunar Day 1 to Day 8. This week we will highlight the crater Janssen, viewable Thursday evening very close to the terminator, and Friday evening. Janssen: [SE/P13; L=40°E] Janssen

Andrew Planck September 26, 2022September 25, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in September, 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)
  • Schickard: Moon Crater Floor with Stripes - August 4, 2025
  • The Longest Distinct Valley on the Moon – Rheita Valley - July 28, 2025
  • Moon Crater Humboldt - July 21, 2025
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