Repost: Understanding waning gibbous moon

Originally posted May 20, 2011.

More gibbous moon goodies from

Because it comes up late at night, the waning gibbous moon prompts [students] to start asking, “Where is the moon? I looked for it last night and couldn’t find it.”

The waning gibbous moon also initiates a rash of questions about seeing the moon during the day. If it rises late at night, you know the waning gibbous moon must set after sunrise.

In fact, in the few days after full moon, you’ll often see the waning gibbous moon in the west in early morning, floating against the pale blue sky.


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