|MLA Citation:||Bloomfield, Louis A. "Question 1548: Why does the ground move slowly when viewed from a jet?"|
How Everything Works 20 May 2018. 20 May 2018 <http://howeverythingworks.org/print1.php?QNum=1548>.
When you watch a distant object move, you don't see it change angles quickly so you perceive it as moving relatively slowly. Take the moon for example: it is moving thousands of miles an hour yet you can't see it move at all. It's just so far away that you see no angular change. And when you look down from a high-flying jet, the distant ground is changing angles slowly and therefore looks like it's not moving fast.