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Astronomer, Teacher, Musician

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Petavius

Petavius: Floor-Fractured Moon Crater

Day 3 Petavius moon crater

The week of June 15-21 takes us from Day 1 to Day 7.  This week we will highlight the moon crater Petavius, visible on Tuesday night close to the terminator. Petavius: [SE/M16; L=60°E] This is one of the most fascinating

Andrew Planck June 15, 2026June 10, 2026 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in June, Moon craters No Comments Read more

Moon Craters that are the First Two Segments of the Great Eastern Chain

Great Eastern Chain on the moon

The week of September 11-17 takes us from Day 27 to Day 3. This week we will highlight The Great Eastern Chain, viewable on Sunday evening. The Great Eastern Chain: [SE/K-N16; L=61°E] There is a conspicuous chain of large moon

Andrew Planck September 11, 2023September 11, 2023 Craters on the Moon, Dates to Observe Objects on the Moon No Comments Read more

The Great Eastern Chain: Series of Moon Craters

Moon crater Furnerius

The week of July 25-31 takes us from Day 27 to Day 3. This week we will highlight a series of craters called the Great Eastern Chain. The Great Eastern Chain: [SE/K-N16; L=61°E] There is a conspicuous chain of large

Andrew Planck July 25, 2022July 25, 2022 chain of moon craters, Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in July, 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)
  • Moon Crater Clavius – Small Notch Chiseled Out of the Terminator - July 20, 2026
  • Moon Crater Janssen – Larger Diameter than Copernicus - July 13, 2026
  • Longomontanus – Exception to the Rule about Moon Craters - July 6, 2026
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