Andrew Planck

Astronomer, Teacher, Musician

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Rilles on the Moon

Moon Craters Rima Hyginus and Mare Vaporum

Moon Craters Rima Hyginus and Mare Vaporum

The week of May 11-17 takes us from Lunar Day 20 to Day 25. This week we will highlight Rima Hyginus, viewable Wednesday morning, and Mare Vaporum, viewable Wednesday & Thursday mornings. Mare Vaporum: [NE/H10; L=4°E] Notice how there are

Andrew Planck May 11, 2020May 12, 2020 Craters on the Moon, Lunar Days in May, Rilles on the Moon, Unusual Features on the Moon No Comments Read more

Rima Sirsalis: The Most Conspicuous Rille on the Moon

Rima Sirsalis: The Most Conspicuous Rille on the Moon

The week of May 4-10 takes us from Lunar Day 12 to Day 19. This week we will highlight the Sirsalis Rilles and the crater Galilaie, viewable on Tuesday evening. Rimae Sirsalis: [SW/L3-4] Just in from the southwest shore of

Andrew Planck May 4, 2020May 4, 2020 Lunar Days in May, Rilles on the Moon, Unusual Features on the Moon No Comments Read more

Moon Crater Manilius and the Sulpicius Gallus Rilles

Moon Crater Manilius and the Sulpicius Gallus Rilles

The week of April 27 – May 3 takes us from Lunar Day 5 to Day 11. This week we will highlight the crater Manilius and the Sulpicius Gallus Rilles, viewable on Wednesday evening, Day 7. Sulpicius Gallus Rilles: [NE/G10-11]

Andrew Planck April 27, 2020April 27, 2020 Dates to Observe Objects on the Moon, Lunar Days in April, Rilles on the Moon No Comments Read more

Rimae Hippalus and Spring Equinox

Rimae Hippalus and Spring Equinox

The week of March 16-22 takes us from Lunar Day 23 to Day 28. This week we will highlight the Hippalus rilles, viewable around 5:00 a.m. on Wednesday morning. Rimae Hippalus: [SW/M6] On the east shore of Mare Humorum you

Andrew Planck March 16, 2020March 17, 2020 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in March, Rilles on the Moon No Comments Read more

Moon Craters Posidonius and le Monnier: Two Craters of Consequence on Mare Serenitatis

Moon Craters Posidonius and le Monnier: Two Craters of Consequence on Mare Serenitatis

The week of January 27-February 2 takes us from Day 3 to Day 8. This week we will highlight the craters Posidonius and le Monnier, viewable on Thursday evening. Posidonius/le Monnier: [NE/F-G13] There are only two craters of any consequence

Andrew Planck January 27, 2020January 28, 2020 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in January, Rilles on the Moon No Comments Read more

Schröter’s Valley: The Moon’s Most Impressive Sinuous Rille

Schröter’s Valley: The Moon’s Most Impressive Sinuous Rille

The week of January 20-26 takes us from Day 25 to Day 2. Unfortunately the Moon is too close to the Sun all week long to observe it, although you might be able to squeeze in something early Tuesday morning.

Andrew Planck January 20, 2020January 20, 2020 Lunar Days in January, Rilles on the Moon No Comments Read more

Rima Hyginus on the Moon and Is Betelgeuse Going Supernova?

Rima Hyginus on the Moon and Is Betelgeuse Going Supernova?

The week of December 30 – January 5 takes us from Day 4 to Day 10. This week we will highlight Rima Hyginus (the Hyginus Rille), viewable on Thursday evening, and the Quadrantid meteor shower. Rima Hyginus: [NE/J10;] At the

Andrew Planck December 30, 2019December 30, 2019 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in January, Rilles on the Moon, Unusual Features on the Moon No Comments Read more

One of the Best Known Lunar Faults: Rupes Cauchy

One of the Best Known Lunar Faults: Rupes Cauchy

I hope everybody caught the transit of Mercury across the face of the Sun on Monday morning! The week of November 11-17 takes us from Day 14 (virtually the Full Moon) to Day 20. This week we will highlight the

Andrew Planck November 11, 2019November 11, 2019 Dates to Observe Objects on the Moon, Faults on the Moon, Interactive Sky Watching Tools, Lunar Days in November, Rilles on the Moon No Comments Read more

Triesnecker Rilles: Mysterious Origin

Triesnecker Rilles: Mysterious Origin

The week of November 4-10 takes us from the end of Day 7 to Day 13. This week we will highlight the Triesnecker rilles, viewable on Monday evening. Triesnecker rilles: [NE/J10] What a great place to poke around with your

Andrew Planck November 4, 2019November 4, 2019 Lunar Days in November, Rilles on the Moon, Unusual Features on the Moon No Comments Read more

The Great Eastern Chain on the Moon

The week of October 14-20 takes us from Day 15 to 21. This week we will highlight a feature commonly referred to as The Great Eastern Chain, viewable on Monday evening. The Great Eastern Chain: [SE/K-N16] There is a conspicuous

Andrew Planck October 14, 2019October 13, 2019 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in October, Rilles on the Moon No Comments Read more
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