what follows you around all day,but almost disappears at lunch time? well, it certainly isn't your dog or cat or your best friend they would all like to have a bite of your noon repast no,the constant companion that goes away only at noon is your shadow.for most of the morning,you cast a shadow by obstructing the sun,which is low in the sky. the higher the sun rises,the smaller your shadow gets.that is because your body blocks less light as the sun reaches its greatest height over your part of the earth.at noon, when the sun is directly overhead,you block almost no light.as a result,your shadow almost disappears.