The week of July 27 – August 2 takes us from Day 7 to Day 13. This week we will highlight the moon crater Bailly, visible on Tuesday night close to the terminator.
Bailly: [SW/R3; L=69°W] To observe this moon crater, it is best to wait for a favorable libration. It is a pity that Bailly lies so close to the western limb. It is the largest crater on our side of the Moon, and at just under 200 miles, it should qualify as a basin. It has ridges, internal craters, and a hint of some multi-ring features. Because its floor has not been flooded by lava, it retains much of the original detail from the moment of its creation. At over three billion years of age it’s a bit tired and worn down, but worth visiting.
OF ADDITIONAL INTEREST IN SPACE
The Delta Aquarid meteors peak on Tuesday.
On July 30, 1971, Apollo 15 lands on the Moon.
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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
- Schrödinger – Large Impact Moon Crater Called a Walled Plain - August 10, 2026
- Longomontanus: Moon Crater Age Not Always Determined by Relative Size - August 3, 2026
- A Hint of Some Multi-Ring Features – Moon Crater Bailly - July 27, 2026