Comments by Natalie Williams Most recent public comments by Natalie Williams https://nowcomment.com/users/11601 the umbra is the shadow of the sun and the penumbra is the shadow of the earth. https://nowcomment.com/documents/27451?scroll_to=275298 https://nowcomment.com/documents/27451?scroll_to=275298 Tue, 28 Jul 2015 19:35:44 -0400