The phrase "phases through shadow" is a bit misleading when talking about the moon. The moon doesn't actually "phase through shadow" in the way you might think.

Here's what's actually happening:

* The moon doesn't have its own light. It reflects sunlight.

* The phases of the moon are caused by the changing angles of sunlight reflecting off the moon as it orbits the Earth.

* Lunar eclipses are the only time the moon passes through the Earth's shadow, and this is a separate phenomenon from the regular phases of the moon.

So, to answer your question, nothing special occurs whenever the moon phases through shadow, because the phases of the moon are simply caused by the changing angles of sunlight hitting it, not by passing through any shadow.

If you're referring to lunar eclipses, then the following occurs:

* The moon passes into the Earth's shadow, causing it to appear darkened or reddish. This happens because the Earth blocks direct sunlight from reaching the moon, but some sunlight is refracted (bent) by the Earth's atmosphere, making the moon appear reddish.

Let me know if you have any other questions!