Showing posts with label language. Show all posts
Showing posts with label language. Show all posts

Friday, 3 July 2015

Mini Blog: Shadows on Celestial Bodies, Umbras, and Umbrellas

I'm going to be starting a series called "Mini Blog", where each post in this series is significantly shorter than the lengthy posts I usually write. In fact, sometimes it may be just a picture. Like this one!

This picture defines umbra, penumbra, and antumbra.

Penumbra in this picture is B, and umbra is A.

The reason why the moon doesn't totally cover up the sun from our perspective on earth during a total eclipse is because the distance between the moon and the earth is around the same distance where the apex of the moon's umbra because of the sun is. Therefore, we see an antumbra instead of a full umbra.

Another fun fact: umbra is the Latin word for shadow. The English word, "umbrella", is also derived from the Latin word "umbra".