Subject: Does a stick's shadow in moonlight point east if it is six inches or longer

I am the coordinator for our homeschool group's Magic Tree House book club. On
pages 42-43 of Night of the Ninjas, the kids are lost in the woods at night and
need to go east. They pushed a stick into the ground in a clearing where there
was moonlight and said that if the stick's shadow is at least six inches long
that the shadow is pointing east. Is this true? If so, why and how does it work?

I have Googled extensively and have not found any mention of this method of
telling direction.

Re: Does a stick's shadow in moonlight point east if it is six inches or longer