Umbral and penumbral shadow cones animation
Animation of the umbral and penumbral shadow cones traveling across the surface of Earth during the August 21, 2017 total solar eclipse. Credit: Goddard Science Visualization Studio, NASA.
- ECLIPSE 101
It is never safe to look directly at the sun – even if the sun is partly obscured. During the short time when the moon completely obscures the sun – known as the period of totality – it is safe to look directly at the star, but it's crucial that you know when to take off and put back on your solar eclipse viewing glasses. - SCIENCE
