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Lunar Days in April

Endymion – Moon Crater

Endymion crater from above the moon

The week of April 27 – May 3 takes us from Day 10 to Day 17. This week we will highlight the moon crater Endymion, visible on Saturday night close to the terminator. Endymion: [NE/D15; L=57°E] This is an older

Andrew Planck April 27, 2026April 21, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April No Comments Read more

Hercules and Atlas: Two Moon Craters Paired Due to Legend

Hercules on the moon

The week of April 20-26 takes us from Day 4 to Day 10.  This week we will highlight the moon craters Hercules & Atlas, visible on Tuesday night close to the terminator. Hercules and Atlas: These two moon craters are

Andrew Planck April 20, 2026April 20, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April No Comments Read more

Endymion – Older Moon Crater Which Resembles Plato

Endymion and coordinates on the moon

The week of April 13-19 takes us from Day 26 to Day 2.  This week we will highlight the moon crater Endymion, visible on Sunday night close to the terminator. Endymion: [NE/D15; L=57°E] This is an older moon crater which

Andrew Planck April 13, 2026April 8, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April, Moon craters No Comments Read more

Aristoteles Adjoins the Moon Crater Mitchell

Aristoteles Adjoins the Moon Crater Mitchell

The week of April 6 – April 12 takes us from Day 19 to Day 20. This week we will highlight the moon crater Eudoxus, visible on Tuesday night close to the terminator. Aristoteles: [NE/D11; L=17°E] Close to the terminator

Andrew Planck April 6, 2026April 1, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April 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

Schiller – A Curiosity on the Moon

Schiller has an unusually elongated crater

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

moon craters 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

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

small moon crater Cameron

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 fault straight wall

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
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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
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