Solar Eclipse

Don't look directly at the Sun. It can cause blindness!

 Use a good safety-approved filter (!) for binoculars or your telescope. Do not look at the price when you buy a filter, because a cheap one is most likely to fail and ruin your eyesight!
Or project the sun on a piece of paper or the ground by poking a hole into some cardboard and let the Sun's light go through that. But do not look through the hole, project the sun's light coming through the hole.

 Two things about the animation are strange. Which?

 Answer
 
 

(200 kB gif) Movies created with Redshift, (c) Maris Multimedia, and GIF construction set, (c) Alchemy Mindworks.