Andrew Planck

Astronomer, Teacher, Musician

Menu

  • Home
  • About
  • Shop
    • Cart
    • Checkout
  • Blog
  • Services
  • Resources
  • Contact

Rilles on the Moon

Moon Crater Janssen Located 85 miles Southwest of the Rheita Valley

Moon Crater Janssen Located 85 miles Southwest of the Rheita Valley

The week of July 7-13 takes us from Day 13 to Day 19. This week we will highlight the moon crater Janssen, visible on Saturday and Sunday nights close to the terminator. Janssen: [SE/P13; L=40°E] Janssen is located 85 miles

Andrew Planck July 7, 2025July 3, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in July, Moon craters, Rilles on the Moon No Comments Read more

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

Rima Sirsalis – Small Overlapping Moon Crater

Rima Sirsalis – Small Overlapping Moon Crater

The week of March 24-30 takes us from Lunar Day 25 to Day 2. This week we will highlight the Rima Sirsalis, visible on Tuesday night close to the terminator. Rimae Sirsalis: [SW/L3-4; L=62°W] Just in from the southwest shore

Andrew Planck March 24, 2025March 20, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in March, Moon craters, Rilles on the Moon No Comments Read more

Rupes Cauchy and Rupes Recta – Best Known Faults on the Moon

Rupes Cauchy and Rupes Recta – Best Known Faults on the Moon

The week of January 27 – February 2 takes us from Lunar Day 28 to Day 5. This week we will highlight Rupes Cauchy, visible on Sunday night close to the terminator. Rupes Cauchy: [NE/J13; L=37°E] Two of the best-known

Andrew Planck January 27, 2025January 27, 2025 Dates to Observe Objects on the Moon, Faults on the Moon, Lunar Days in February, Lunar Days in January, Rilles on the Moon No Comments Read more

Rimae Sirsalis: Two Small Overlapping Moon Craters – Sirsalis and Sirsalis A

The week of December 23-29 takes us from Lunar Day 23 to Day 29. This week we will highlight a feature called Rimae Sirsalis, visible on Thursday night. Rimae Sirsalis: [SW/L3-4; L=62°W] Just in from the southwest shore of Oceanus

Andrew Planck December 23, 2024December 6, 2024 chain of moon craters, Lunar Days in December, Rilles on the Moon No Comments Read more

Moon Crater Rima Hyginus – Line of Linked Craters

Moon Crater Rima Hyginus – Line of Linked Craters

The week of December 2 – December 8 takes us from Lunar Day 2 to Day 8. This week we will highlight Rima Hyginus, visible on Saturday night. Rima Hyginus: [NE/J10; L=8°E] At the west end of the Ariadaeus rille,

Andrew Planck December 2, 2024November 21, 2024 chain of moon craters, Craters on the Moon, Lunar Days in December, Moon craters, Rilles on the Moon No Comments Read more

Series of Rilles on the Moon: Rimae Sirsalis

Series of Rilles on the Moon: Rimae Sirsalis

The week of July 29 – August 4 takes us from Day 24 to New Moon. This week we will highlight a series of rilles called Rimae Sirsalis, located in the SW quadrant of the Field Map and viewable on

Andrew Planck July 29, 2024July 30, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in August, Lunar Days in July, Rilles on the Moon, Uncategorized No Comments Read more

Rupes Cauchy: A Best Known Fault on the Moon

Rupes Cauchy: A Best Known Fault on the Moon

The week of July 22-28 takes us from Day 17 to Day 23. This week we will highlight Rupes Cauchy, viewable on Wednesday night and located in the NE quadrant of the Field Map at J13. Rupes Cauchy: [NE/J13; L=37°

Andrew Planck July 22, 2024July 19, 2024 Dates to Observe Objects on the Moon, Faults on the Moon, Lunar Days in July, 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
  • « Previous

Categories

Fill out my online form.

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

  • Author
  • Recent Posts
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 Maurolycus in the Lunar Highlands - July 14, 2025
  • 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
Copyright © 2025 Andrew Planck. Powered by WordPress. Theme: Spacious by ThemeGrill.