The week of May 30-June 5 takes us from New Moon to Day 6. This week we will highlight the moon crater Mare Nectaris, viewable on Saturday evening, Day 5.

On the moon Mare NectarisMare Nectaris: [SE/L13] The Nectaris basin was excavated 3.9 billion years ago. The oldest features on the Moon formed prior to this event. Mare Nectaris is a classic example of a multi-ring basin. Sunday evening will reveal the attendant Rupes Altai, a high cliff that is a conspicuous fragment of one of the original rings. As the Sun rises over the region, try to locate hints of other ring features surrounding Mare Nectaris.


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
Moon Crater Mare Nectaris: Example of Multi-Ring Basin

Leave a Reply

Your email address will not be published. Required fields are marked *