The week of May 22-28 takes us from Day 3 to Day 9. This week we will highlight the Sulpicius Gallus rilles on the moon, viewable on Friday evening.

Sulpicius Gallus RillesSulpicius Gallus Rilles: [NE/G10-11; L=10°E] These rilles, located on the south-western shore of Mare Serenitatis, are the result of Serenity lava flows that were so heavy that the basin center subsided and opened up substantial cracks around the shore line.


On Tuesday, Venus is 2° south of the Moon, and on Wednesday, Mars is 4° south of the Moon.


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 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]

Courtesy of Gray Photography of Corpus Christi, Texas
Lunar photos: NASA / USGS / BMDO / LROC / ASU / DLR / LOLA / Moon Globe. Used by permission

Andrew Planck
Sulpicius Gallus Rilles on the Moon
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