Andrew Planck

Astronomer, Teacher, Musician

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Lunar Days in April

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

Schiller – A Curiosity on the Moon

Schiller – A Curiosity on the Moon

The week of April 21-27 takes us from Lunar Day 24 to Day New Moon. This week we will highlight the moon crater Schiller, visible on Tuesday night. Schiller: [SW/Q6; L=39°W] Schiller is a curiosity. It has the appearance of

Andrew Planck April 21, 2025April 5, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April, Moon craters No Comments Read more

Two Largest Intact Moon Craters on Mare Crisium: Peirce and Picard

Two Largest Intact Moon Craters on Mare Crisium: Peirce and Picard

The week of April 14-20 takes us from Lunar Day 17 to Day 22. This week we will highlight moon craters Peirce and Picard, visible on Saturday night. Peirce & Picard: [NE/H15; L=54°E] The two largest intact moon craters on

Andrew Planck April 14, 2025April 5, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April, Moon craters No Comments Read more

Sinus Iridum – Bay of Rainbows on the Moon

Sinus Iridum – Bay of Rainbows on the Moon

The week of April 7-13 takes us from Lunar Day 10 to Day 16. This week we will highlight Sinus Iridum, visible on Tuesday night close to the terminator. Sinus Iridum: [NW/E6; L=32°W] Sinus Iridum (the Bay of Rainbows), located

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

Moon Crater Taruntius

Moon Crater Taruntius

The week of March 31-April 6 takes us from Lunar Day 3 to Day 9. This week we will highlight the moon crater Taruntius, visible on Tuesday night close to the terminator. Taruntius: [NE/J14; L=47°E] Located on the north shore

Andrew Planck March 31, 2025March 27, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Floor Fractured Moon Craters, Lunar Days in April, Lunar Days in March, Simple Moon Craters No Comments Read more

Rupes Recta – The Straight Wall on the Moon

Rupes Recta – The Straight Wall on the Moon

The week of April 29 – May 5 takes us from Day 20 to Day 27. This week we will highlight Rupes Recta, the Straight Wall, viewable early Wednesday morning, Day 22, and located in the SW quadrant of the

Andrew Planck April 29, 2024April 26, 2024 Dates to Observe Objects on the Moon, Faults on the Moon, Lunar Days in April No Comments Read more

Trio of Moon Craters with Distinct Personalities

Trio of Moon Craters with Distinct Personalities

The week of April 22-28 takes us from Day 14 to Day 19. This week we will highlight the moon craters Theophilus, Cyrillus, and Catharina viewable on Sunday morning before sunrise and located in the SE quadrant of the Field

Andrew Planck April 22, 2024April 18, 2024 chain of moon craters, Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April, Moon craters No Comments Read more

Hippalus Rilles on the Moon

Hippalus Rilles on the Moon

The week of April 15-21 takes us from Day 8 to Day 13. This week we will highlight Rimae Hippalus, the Hippalus Rilles, viewable on Thursday and Friday evening and located in the SW quadrant of the Field Map at

Andrew Planck April 15, 2024April 12, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April, Rilles on the Moon 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

Crater Longomontanus on the Moon

Crater Longomontanus on the Moon

The week of April 1-7 takes us from Day 22 to 28. This week we will highlight the moon crater Longomontanus, viewable on Tuesday morning before sunrise. Longomontanus: [SW/P7; L=22°W] Take a look at Longomontanus and before reading further, decide

Andrew Planck April 1, 2024March 16, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April 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)
  • Complex Moon Crater Pythagoras - November 3, 2025
  • Theophilus, Cyrillus, Catharina Moon Craters West of Mare Nectaris - October 27, 2025
  • Moon Crater Humboldt Best Viewed When Pronounced Libration - October 20, 2025
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