femurphy77
Grandmaster
It only does that because you're moving with it in the same frame of reference. To an observer in a fixed frame of reference, it would take a curved path because the Earth is accelerating (rotating and also revolving around the Sun).
[video=youtube;JUOGxePBs50]https://www.youtube.com/watch?v=JUOGxePBs50[/video]