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Andrew Planck

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Saturn

Ghost Crater Lamont: Remnant of a Small Multi-Ring Impact Basin

Ghost Crater Lamont: Remnant of a Small Multi-Ring Impact Basin

The week of September 25 – October 1 takes us from Day 5 to Day 11, a very rewarding time to be observing the Moon. This week we will highlight the ghost crater Lamont, visible on Monday night late. Lamont:

Andrew Planck September 25, 2017September 25, 2017 Craters on the Moon, Dates to Observe Objects on the Moon, Lunar Days in September, Saturn, Unusual Features on the Moon No Comments Read more

Valentine Dome on the #Moon

Valentine Dome

The week of April 17 – 23 takes us from Lunar Day 20 to 27, so the Moon would have to be viewed in the wee hours before sunrise. This week we will highlight what is informally called the Valentine

Andrew Planck April 17, 2017April 16, 2017 Lunar Days in April, Saturn No Comments Read more

Rupes Altai: Circular Mountain Range on Moon Whose Highest Peaks Rise to 13,000 Feet

Rupes Altai is a circular mountain range whose highest peaks rise to 13,000 feet.

The week of October 3rd – 9th takes us from the end of Lunar Day 2 to the beginning of Day 8, a very fruitful time for observing. This week we will highlight the Altai Scarp, visible on Thursday. Altai

Andrew Planck October 3, 2016October 3, 2016 Craters on the Moon, Lunar Days in October, Saturn No Comments Read more

Rimae Triesnecker: One of the Moon’s Many Enigmas

Rimae Triesnecker

The week of July 11th – July 17th takes us from lunar Day 7 through the end of Day 12. Monday at 8:52 PM EDT is the moment of true dichotomy. At that time the terminator (the shadow line) splits

Andrew Planck July 11, 2016July 11, 2016 Enigma of the Moon, Rilles on the Moon, Saturn No Comments Read more

Critical to Understanding an Important Process That Shaped the Moon: Craters in the Fra Mauro Region

Critical to Understanding an Important Process That Shaped the Moon: Craters in the Fra Mauro Region

The week of June 13-19 takes us from lunar Day 9 through Day 14, almost Full Moon. The first part of the week, before we get to Full Moon, will be the most rewarding time to view individual craters. This

Andrew Planck June 13, 2016June 13, 2016 Craters on the Moon, Lunar Days in June, Mars, Saturn No Comments Read more

Moon Craters Geminus and Burckhardt: Discover the crater with the “Mickey Mouse” ears

The week of May 23-29 takes us from lunar Day 17 through Day 22. The beginning of the week is shortly after full Moon and the position of the terminator corresponds roughly to where it was on Day 3, only

Andrew Planck May 23, 2016May 30, 2016 Apps for Observing the Moon and Objects, Craters on the Moon, Jupiter, Lunar Days in May, Saturn No Comments Read more

Cauchy Domes on the Moon and Saturn a Showstopper: Lunar Days 18-24

Cauchy Domes on the Moon and Saturn a Showstopper: Lunar Days 18-24

The week of April 25-May 1st takes us from lunar Day 18 through Day 24. Full moon has passed and the terminator has advanced enough that we can begin to see clearly delineated features close to it. This week we

Andrew Planck April 25, 2016April 24, 2016 Cauchy Domes on the Moon, Jupiter, Lunar Days in April, Saturn 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)
  • Petavius: Floor-Fractured Moon Crater - June 15, 2026
  • Mare Humorum: “Sea of Moisture” Basin One of Best Examples of Subsidence - June 8, 2026
  • Moon Crater Bailly – Over 3 Billion Years Old - June 1, 2026
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