The ghostly image at the top of this post is a new moon. When the moon is new, its lighted half is facing entirely away from Earth, and its night face is facing us. That’s why we can’t see the moon at this time.
New moon comes on October 1 at 0011 UTC. Translate to your time zone.
You likely won’t see the moon on October 1, unless – like Thierry Legault whose photo appears at the top of this post – you are using special equipment. Modern techniques – telescopes, filters, photography – have made it possible to see the moon even at the instant of new moon. That’s the case with Legault’s image, which he acquired in 2013. Read more about that image here.
One to several days after new moon, the moon appears in the west after sunset. Then it is called a “young” moon.
A typical young moon sighting, for most people with ordinary eyesight, comes when the moon is around 24 hours from new, or more.
On the day of new moon itself, however, most of us can’t see the moon with the eye alone for several reasons. First, at new moon, the moon rises when the sun rises. It sets when the sun sets. It crosses the sky with the sun during the day. A new moon is too close to the sun’s glare to be visible with the eye. Plus its lighted hemisphere is facing entirely away from us. It’s only as the moon moves in orbit, as its lighted hemisphere begins to come into view from Earth, that we can see it in our sky.
We can’t see the new moon from Earth, except during the stirring moments of a solar eclipse. Then the moon passes in front of the sun, and the night side of the moon can be seen in silhouette against the disk of the sun. Meanwhile, if you could travel in a spaceship to the opposite side of the moon, you’d see it shining brightly in daylight.
Once each month, the moon comes all the way around in its orbit so that it is more or less between us and the sun. If the moon always passed directly between the sun and Earth at new moon, a solar eclipse would take place every month.
But that doesn’t happen every month. Instead, in most months, the moon passes above or below the sun as seen from our earthly vantage point.
Then a day or two later, the moon reappears, in the west after sunset. Then it’s a slim waxing crescent visible only briefly after sunset – what some call a young moon.
As the moon orbits Earth, it changes phase in an orderly way. Follow these links to understand the various phases of the moon.
Where’s the moon? Waxing crescent
Where’s the moon? First quarter
Where’s the moon? Waxing gibbous
What’s special about a full moon?
Where’s the moon? Waning gibbous
Where’s the moon? Last quarter
Where’s the moon? Waning crescent
Where’s the moon? New phase
Deborah Byrd created the EarthSky radio series in 1991 and EarthSky.org in 1994. Today, she serves as Editor-in-Chief of this website. She has won a galaxy of awards from the broadcasting and science communities, including having an asteroid named 3505 Byrd in her honor. A science communicator and educator since 1976, Byrd believes in science as a force for good in the world and a vital tool for the 21st century. "Being an EarthSky editor is like hosting a big global party for cool nature-lovers," she says.