Andrew Planck

Astronomer, Teacher, Musician

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Rilles on the Moon

One of the Moon’s Best Examples of Subsidence: Moon Crater Fracastorius

One of the Moon’s Best Examples of Subsidence: Moon Crater Fracastorius

The week of March 20-26 takes us from Day 29 to Day 6 This week we will highlight the moon crater Fracastorius, located in the SE quadrant of the Field Map and viewable on Sunday night. Fracastorius: [SE/M13; L=33°E] Located

Andrew Planck March 20, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in March, Rilles on the Moon No Comments Read more

Rima Ariadaeus – Ariadaeus Rille

Rima Ariadaeus – Ariadaeus Rille

The week of February 20-26 takes us from Lunar Day 1 to Day 7. This week we will highlight Rima Ariadaeus, located in the NE quadrant of the Field Map and viewable on Sunday night. Ariadaeus: [NE/J11; L=17°E] The Ariadaeus

Andrew Planck February 20, 2023February 18, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in February, Moon craters, Rilles on the Moon, Venus No Comments Read more

Moon Crater Gassendi: One of Moon’s Most Beautiful and Interesting Objects

Moon Crater Gassendi: One of Moon’s Most Beautiful and Interesting Objects

The week of January 16 to January 22 takes us from Lunar Day 24 to Day 0.6. This week we will highlight the moon crater Gassendi. Gassendi: [SW/L5; L=40°W] Three generations of crater age can be easily observed on Mare

Andrew Planck January 16, 2023January 13, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Floor Fractured Moon Craters, Lunar Days in January, Rilles on the Moon No Comments Read more

Rupes Recta and Rupes Cauchy: Two of the Best-Known Faults on the Moon

Rupes Recta and Rupes Cauchy: Two of the Best-Known Faults on the Moon

The week of December 26 – January 1 takes us from Lunar Day 4 to Day 10. This week we will highlight the fault Rupes Cauchy located on the moon in the NE quadrant of the Field Map and viewable

Andrew Planck December 26, 2022December 20, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Faults on the Moon, Lunar Days in December, Rilles on the Moon No Comments Read more

Moon Crater Hippalus – Finest Examples of Arcuate Rilles

Moon Crater Hippalus – Finest Examples of Arcuate Rilles

This week we will highlight the Hippalus rilles on the moon, viewable early Wednesday morning, and the Leonid meteor shower. Rimae Hippalus: [SW/M6] On the east shore of Mare Humorum, you will find the remnant of the moon crater Hippalus,

Andrew Planck November 14, 2022November 9, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in November, Rilles on the Moon No Comments Read more

Moon Crater Janssen versus Copernicus, Queen of Moon Craters

Moon Crater Janssen versus Copernicus, Queen of Moon Craters

The week of September 26 – October 2 takes us from Lunar Day 1 to Day 8. This week we will highlight the crater Janssen, viewable Thursday evening very close to the terminator, and Friday evening. Janssen: [SE/P13; L=40°E] Janssen

Andrew Planck September 26, 2022September 25, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in September, Rilles on the Moon No Comments Read more

The Great Eastern Chain: Series of Moon Craters

The Great Eastern Chain: Series of Moon Craters

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

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

Moon Crater Rima Hyginus: Located at a Pivot Point

Moon Crater Rima Hyginus: Located at a Pivot Point

The week of February 7-13 takes us from Day 7 to Day 12. This week we will highlight Rima Hyginus and Rima Ariadaeus, located in the NE quadrant at J10 & J11 on your field map. Rima Hyginus: [NE/J10; L=8°E]

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

Hippalus Rilles on the Moon

Hippalus Rilles on the Moon

The week of December 27 – January 2 takes us from Day 23 to New Moon. This week we will highlight the Hippalus Rilles located in the SW quadrant of the Field Map at M6 and viewable on Tuesday morning.

Andrew Planck December 27, 2021December 23, 2021 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in December, Rilles on the Moon No Comments Read more
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