Andrew Planck

Astronomer, Teacher, Musician

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Mare Serenitatis

Posidonius and le Monnier – Two Moon Craters on Mare Serenitatis

Posidonius and le Monnier – Two Moon Craters on Mare Serenitatis

The week of March 3-9 takes us from Lunar Day 4 to Day 10. This week we will highlight the moon craters Posidonius and le Monnier visible on Tuesday night. Posidonius/le Monnier: [NE/F-G13; L=30°E] There are only two craters of

Andrew Planck March 3, 2025February 27, 2025 Craters on the Moon, Dates to Observe Objects on the Moon, Floor Fractured Moon Craters, Lunar Days in March, Moon craters No Comments Read more

Sulpicius Gallus Rilles on the Moon

Sulpicius Gallus Rilles on the Moon

The week of May 22-28 takes us from Day 3 to Day 9. This week we will highlight the Sulpicius Gallus rilles on the moon, viewable on Friday evening. Sulpicius Gallus Rilles: [NE/G10-11; L=10°E] These rilles, located on the south-western

Andrew Planck May 22, 2023May 17, 2023 Lunar Days in May, Mars, Rilles on the Moon, Venus No Comments Read more

Mare Frigoris on the Moon and the Gargantuan Hypothesis

Mare Frigoris on the Moon and the Gargantuan Hypothesis

The week of January 30 to February 5 takes us from Lunar Day 10 to Day 15. This week we will highlight Mare Frigoris, located in the NE quadrant of the Field Map and viewable on Tuesday evening. Mare Frigoris:

Andrew Planck January 30, 2023January 25, 2023 Gargantuan hypothesis, Lunar Days in January No Comments Read more

Moon Craters Posidonius and le Monnier – Examples of Subsidence

Moon Craters Posidonius and le Monnier – Examples of Subsidence

The week of March 7-13 takes us from Day 5 to Day 11. This week we will highlight moon craters Posidonius and le Monnier, viewable on Tuesday evening. Posidonius/le Monnier: [NE/F-G13; L=30°E] There are only two craters of any consequence

Andrew Planck March 7, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in March, Subsidence on the Moon No Comments Read more

Mare Frigoris: Only Lunar Mare Patch Not Circular

Mare Frigoris: Only Lunar Mare Patch Not Circular

The week of November 15-21 takes us from Day 12 to Day 17. This week we will highlight Mare Frigoris. Mare Frigoris: [NW-NE/D6-13; L=54°W] This is the only mare patch that isn’t even roughly circular, although its northern boundary has

Andrew Planck November 15, 2021November 14, 2021 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in November No Comments Read more

Largest dome on the Moon: Valentine Dome

Largest dome on the Moon: Valentine Dome

The week of September 2-8 takes us from Day 4 to Day 10. This week we will highlight the Valentine Dome, viewable on Thursday evening. Valentine Dome: [NE/F11] Keep a close eye on the movement of the terminator, and when

Andrew Planck September 2, 2019September 2, 2019 Dates to Observe Objects on the Moon, Domes on the Moon, Jupiter, Lunar Days in September, Saturn, Volcanic Dome 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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