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Mare Crisium

Sea of Crises – First Large Sea to Become Visible on the Waxing Moon

Mare Crisium Day 4

The week of March 16-22 takes us from Day 28 to Day 4.  This week we will highlight the Sea of Crises, visible on Sunday night close to the terminator. Mare Crisium: [NE/H15; L=59°E] On Day 3 the Sea of

Andrew Planck March 16, 2026March 12, 2026 "Seas" on the Moon, Dates to Observe Objects on the Moon, Lunar Days in March No Comments Read more

Cleomedes: First Significant Moon Crater North of Mare Crisium

Cleomedes

The week of September 1-7 takes us from Day 10 to Day 16. This week we will highlight the moon crater Cleomedes, visible on Sunday night. Cleomedes: [NE/G15; L=56°E] Cleomedes is the first significant moon crater just north of Mare

Andrew Planck September 1, 2025August 28, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in September, Moon craters, Rilles on the Moon 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

Moon Craters Cleomedes and Proclus

Proclus small moon crater located just west of Mare Crisium

The week of March 10-16 takes us from Lunar Day 11 to Day 17. This week we will highlight the moon craters Cleomedes and Proclus visible on Sunday night close to the terminator. Cleomedes: [NE/G15] Cleomedes is the first significant

Andrew Planck March 10, 2025March 6, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in March, Moon craters No Comments Read more

The Flying Eagle on the Moon – Western Edge of Mare Crisium

The Flying Eagle on the moon

The week of June 17-23 takes us from Lunar Day 11 to Day 17. This week we will highlight an object informally known as the Flying Eagle on the moon, located on the western edge of Mare Crisium and in

Andrew Planck June 17, 2024June 12, 2024 Lunar Days in June, Unusual Features on the Moon No Comments Read more

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

Peirce & Picard - two largest intact moon craters

The week of April 17-April 23 takes us from Day 27 to Day 4. This week we will highlight the craters Peirce & Picard, located in the western portion of Mare Crisium and viewable on Sunday evening. Peirce & Picard:

Andrew Planck April 17, 2023April 13, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in April, Wrinkle Ridge on the moon No Comments Read more

Moon Crater Proclus: One of the Brightest Spots on the Moon

Proclus crater on the moon

The week of January 9 to January 15 takes us from Lunar Day 17 to Day 22. This week we will highlight the moon crater Proclus, near Mare Crisium. Proclus: [NE/H14; L=47°E] Proclus is a small moon crater located just

Andrew Planck January 9, 2023January 4, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in January No Comments Read more

Wrinkle Ridge Dorsum Oppel on the Moon and the Lunar Eclipse

series of wrinkle ridges on the moon known as Dorsum Oppel

The week of November 7-13 takes us from Lunar Day 15 to Day 20. This week we will highlight the wrinkle ridge Dorsum Oppel on the moon and the lunar eclipse. Dorsum Oppel: [NE/H15; L=53°E] As the lava cooled following

Andrew Planck November 7, 2022November 9, 2022 Lunar Days in November, Lunar Eclipse, Lunar Observers, Unusual Features on the Moon, Wrinkle Ridge on the moon No Comments Read more

The Flying Eagle on the Moon – Wrinkle Ridge Dorsum Oppel

The Flying Eagle and Mare Crisium on the moon

This week we will highlight the wrinkle ridge Dorsum Oppel, a feature informally known as “the Flying Eagle,” viewable on Saturday evening. The Flying Eagle: [NE/H15] As the lava cooled following the impact that created Mare Crisium, a series of

Andrew Planck June 27, 2022 Lunar Days in June, Unusual Features on the Moon, Wrinkle Ridge on the moon No Comments Read more

Promontorium Agarum and the First Supermoon of 2022

Promontorium Agarum

The week of June 13-19 takes us from Day 14 to Day 20. This week we will highlight the feature known as Promontorium Agarum on Mare Crisium, viewable in the early morning hours of Wednesday, June 15. Promontorium Agarum: [NE/H16;

Andrew Planck June 13, 2022June 13, 2022 Dates to Observe Objects on the Moon, Lunar Days in June, Unusual Features 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)
  • Sea of Crises – First Large Sea to Become Visible on the Waxing Moon - March 16, 2026
  • One of the Moon’s Loveliest Sights – Moon Crater Plato - March 9, 2026
  • Moon Crater Endymion Resembles Plato - March 2, 2026
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