The Moon Guide
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Courtesy
U. S. N. O.
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The phase of the Moon right now

Phase
 
spacer  The three-day crescent Moon

< Drawing the Moon

Crescent Moon
The three-day-old Moon
People often refer to a crescent Moon as a 'new Moon', and there's nothing wrong with this, but astronomers sometimes consider the moment when the Moon is directly between us and the Sun as the true new Moon. The phase of the Moon is described in days after this moment, so the thin crescent we see in an evening sky is already a few days old.

In practice it is very hard to see a crescent Moon younger than 24 hours old, and a two-day old Moon is usually about the thinnest that you will see. Even if you do spot one, you will hardly see any detail on it.

This crescent Moon is about three days old. Use it to identify a few prominent features:
1 Geminus
2 Cleomedes
3 Mare Crisium
4 Langrenus
5 Petavius

For a map showing more features, go to our interactive Moon map.


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Crescent Moon

Observing the Moon

Moon lighting

'Seas' and mountains

How much can you see?

Using binoculars and telescopes

Drawing the Moon

Getting to know the Moon

Three-day crescent Moon

Six-day crescent Moon

First-quarter Moon

Gibbous Moon

Interactive Moon map

 
spacerMaintained by SPA Webmaster: Last modified 6 November 2008
 
International Year of AstronomySociety for Popular AstronomySociety for Popular Astronomy