Andrew Planck

Astronomer, Teacher, Musician

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Lunar X

Lunar X on the Moon: Intersection of the Rims of Blanchinus, La Caille, and Purbach

Lunar X on the Moon: Intersection of the Rims of Blanchinus, La Caille, and Purbach

The week of December 16-22 takes us from Lunar Day 16 to Day 22. This week we will highlight an item informally referred to as the “Lunar X,” visible on Sunday night. Lunar X: [SE/M10; L=1°E] Around 6 days 22

Andrew Planck December 16, 2024December 6, 2024 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in December No Comments Read more

Triesnecker Rilles on the Moon: A Complex System Resembling a Railway Switchyard

Triesnecker Rilles on the Moon: A Complex System Resembling a Railway Switchyard

The week of April 4-10 takes us from Day 4 to Day 9. This week we will highlight the Triesnecker rilles on the moon and an object informally known as the “Lunar X.” Triesnecker Rilles: [NE/J10] What a great place

Andrew Planck April 4, 2022April 3, 2022 Dates to Observe Objects on the Moon, Lunar Days in April, Rilles on the Moon, Unusual Features on the Moon No Comments Read more

Where Angels Fear to Tread: Moon Crater Maurolycus

Where Angels Fear to Tread: Moon Crater Maurolycus

The week of May 17-23 takes us from Lunar Day 6 to Day 12. This week we will highlight the crater Maurolycus, viewable on Tuesday evening, Day 7. Maurolycus: [SE/P11] Let us venture briefly into a region where angels fear

Andrew Planck May 17, 2021May 16, 2021 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in May No Comments Read more

Brilliantly Lit “X” in the Sky – Lunar X

Brilliantly Lit “X” in the Sky – Lunar X

The week of February 11-17 takes us from Day 6 through Day 12. This week we will highlight the feature informally known as the Lunar X. Lunar X: [SE/M10] Around 6 days 22 hours (depending on libration – you have

Andrew Planck February 11, 2019February 18, 2019 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in February, Mars, Unusual Features on the Moon, Uranus 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 Cassini – Created on Imbrium floor Before Lavas Started to Flow - January 19, 2026
  • Bailly – Largest Crater on Our Side of the Moon - January 12, 2026
  • Longomontanus: Exception to the Rule About Moon Crater Age - January 5, 2026
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