Just a sliver tonight. Too small to really see.
It is Monday. May 18. The moon is Waxing. Barely. NASA’s Daily Moon Guide puts illumination at a thin 3%. Basically nothing.
You won’t spot craters. There is too little light hitting the surface to show anything anyway. Just a dark shadow with a tiny hint of silver on the edge.
Patience.
The calendar says there are two Full Moons this month. The next one hits on May 31. Wait for it.
Why does it change? Orbit. Light. Perspective.
The moon takes 29.5 days to loop around Earth. That is one full cycle. It goes through eight distinct shapes in that time.
Here is how it breaks down.
We always see the same side, but the angle of sunlight changes.
That geometry creates the illusion of waxing and waning. It’s all about shadow.
The Eight Phases:
- New Moon – Between us and the sun. The face is dark. Invisible to the naked eye.
- Waxing Crescent – A sliver of light. Usually on the right in the Northern Hemisphere.
- First Quarter – Half lit. Looks like a D shape from the right.
- Waxing Gibbous – More than half. Not quite there yet.
- Full Moon – The whole face lights up.
- Waning Gibbous – Starting to lose light on the right side.
- Third Quarter – Another half. But this time the left side glows.
- Waning Crescent – Fading back down. A thin slice on the left before the darkness returns.
Simple mechanics. But still magic when you look up.
