Moon Phases

What is a waning crescent moon?

Exceedingly thin crescent moon on an orange twilight background.
View at EarthSky Community Photos. | Steven A. Sweet of Lunar 101 Moon Book caught this amazing little waning crescent moon – only 16 hours and 54 minutes from new moon – on August 18, 2020. Congratulations, Steven!

You’ll see a waning crescent moon – sometimes called an old moon – in the east before dawn.

On each successive morning, a waning crescent moon will show us less and less of its lighted portion, or day side. Each day, it rises closer to the sunrise, heading for new moon, when the moon will be between the Earth and sun.

The illuminated side of a waning crescent moon always points eastward, or in the direction of sunrise.

What’s more, the lit side of waning crescent points in the direction of the moon’s daily motion relative to the backdrop stars and planets of the zodiac. That direction is also east.

Many people miss the waning crescent moon because it’s a morning moon, visible before sunrise. But it’s fun to follow the waning crescent day by day, as it inches into the dawn glare.

As the moon orbits Earth, it changes phase in an orderly way. Follow the links below to understand the phases of the moon.

New moon
Waxing crescent moon
First quarter moon
Waxing gibbous moon
Full moon
Waning gibbous moon
Last quarter moon
Waning crescent moon

Read more: 4 keys to understanding moon phases

Overexposed glowing crescent with rest of moon faintly visible and rays coming off it.
Here’s a waning crescent moon – 27% illuminated, with earthshine – and showing a humidity-induced lens flare. Photo by Greg Diesel Walck – Lunar/Landscape Photographer.

Bottom line: A waning crescent moon falls between the last quarter moon phase and the new moon phase. You’ll find a waning crescent moon in the east before sunrise.

Check out EarthSky’s guide to the bright planets.

Top 4 keys to understanding moon phases

Help EarthSky keep going! Please donate.

Posted 
January 1, 2021
 in 
Moon Phases

Like what you read?
Subscribe and receive daily news delivered to your inbox.

Your email address will only be used for EarthSky content. Privacy Policy
Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.

More from 

Deborah Byrd

View All