Andrew Planck

Astronomer, Teacher, Musician

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Mare Nubium

Rupes Recta – The Straight Wall on the Moon

Rupes Recta – The Straight Wall on the Moon

The week of April 29 – May 5 takes us from Day 20 to Day 27. This week we will highlight Rupes Recta, the Straight Wall, viewable early Wednesday morning, Day 22, and located in the SW quadrant of the

Andrew Planck April 29, 2024April 26, 2024 Dates to Observe Objects on the Moon, Faults on the Moon, Lunar Days in April No Comments Read more

Bullialdus: The Most Conspicuous Moon Crater on Mare Nubium

Bullialdus: The Most Conspicuous Moon Crater on Mare Nubium

The week of February 27 – March 5 takes us from Lunar Day 8 to Day 14. This week we will highlight the moon crater Bullialdus, located in the SW quadrant of the Field Map and viewable on Wednesday night.

Andrew Planck February 27, 2023February 26, 2023 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in February No Comments Read more

Apennine Mountain Range and Rupes Recta, the Straight Wall, on the Moon

Apennine Mountain Range and Rupes Recta, the Straight Wall, on the Moon

The week of October 31 – November 6 takes us from Lunar Day 7 to Day 13. This week we will highlight the Apennine Mountain range, located on the Field Map at [NW/G9] and viewable Tuesday evening, and Rupes Recta,

Andrew Planck October 31, 2022October 28, 2022 Dates to Observe Objects on the Moon, Faults on the Moon, Lunar Days in November, Lunar Days in October No Comments Read more

Moon Crater Bullialdus and Ghost Moon Crater Lambert-R

Moon Crater Bullialdus and Ghost Moon Crater Lambert-R

The week of October 3-9 takes us from Lunar Day 7 to Full Moon. This week we will highlight the moon crater Bullialdus and the ghost crater Lambert-R, immediately above the crater Lambert, both viewable on Tuesday evening. Bullialdus: [SW/M7]

Andrew Planck October 3, 2022September 25, 2022 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in September No Comments Read more

Moon Crater Bullialdus and Ghost Crater Lambert-R

Moon Crater Bullialdus and Ghost Crater Lambert-R

The week of August 30 – September 5 takes us from Lunar Day 22 to Day 28. This week we will highlight the moon crater Bullialdus and the ghost crater Lambert-R, immediately above the moon crater Lambert, both viewable around

Andrew Planck August 30, 2021August 28, 2021 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in August No Comments Read more

Moon Crater Walther and Moon Crater Deslandres

Moon Crater Walther and Moon Crater Deslandres

The week of June 28 – July 4 takes us from Lunar Day 19 to Day 24. This week we will highlight the craters Walther and Deslandres, viewable after midnight on Wednesday. Walther: [SW/N9] You will find this 87-mile crater

Andrew Planck June 28, 2021June 29, 2021 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in June, Unusual Features on the Moon No Comments Read more

Moon Crater Bullialdus: Most Conspicuous Crater on Mare Nubium

Moon Crater Bullialdus: Most Conspicuous Crater on Mare Nubium

The week of August 10-16 takes us from Lunar Day 22 to Day 27. This week we will highlight the crater Bullialdus, visible on Wednesday morning, and the Perseid meteor shower. Bullialdus: If you recall what Tycho looked like yesterday

Andrew Planck August 10, 2020August 10, 2020 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in August, Meteor Shower No Comments Read more

Moon Crater Bullialdus: Floor Creates a Small Illusion

Moon Crater Bullialdus: Floor Creates a Small Illusion

The week of October 21-27 takes us from Day 22 to 29. This week we will highlight the crater Bullialdus, viewable at 4:00 a.m. on Tuesday morning. Bullialdus: [SW/M7; L=22°W] If you recall what Tycho looked like yesterday morning, Bullialdus

Andrew Planck October 21, 2019October 20, 2019 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in October No Comments Read more

Bullialdus: Most Conspicuous #MoonCrater on Mare Nubium

Bullialdus: Most Conspicuous #MoonCrater on Mare Nubium

The week of December 11 – 17 takes us from the end of Day 23 to Day 29. This week we will highlight the crater Bullialdus, viewable as soon as the Moon rises early Tuesday morning. Bullialdus: [SW/M7; L=22°W] If

Andrew Planck December 11, 2017 Craters on the Moon, Lunar Days in December, Unusual Features on the Moon No Comments Read more

Bullialdus: The Most Conspicuous Moon Crater and the Winter Hexagon

Bullialdus: The Most Conspicuous Moon Crater and the Winter Hexagon

The week of Feb. 6–12 takes us from Lunar Day 10 through Day 16. This week we will highlight the crater Bullialdus (a repeat from the Oct. 24th blog since Bullialdus was only visible during the early morning hours and

Andrew Planck February 6, 2017February 6, 2017 Craters on the Moon, Lunar Days in February 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 Janssen Located 85 miles Southwest of the Rheita Valley - July 7, 2025
  • Albategnius – How to Observe This Stunning Moon Crater Near the Terminator - June 30, 2025
  • Vallis Rheita: The Moon’s Longest Valley and a Stunning Lunar Observation Target This Week - June 23, 2025
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