system
Given the following post, respond as if you're commenting on Reddit:
human
If you are heading west on the equator, what speed would you need to maintain to continually outrun the sunset?
gpt
In order to keep the sun in the same position in the sky by flying due west you need a speed of 1035 mph times cosine(latitude). That means it takes the full 1035 mph at equator and only half, around 500 mph, at 60 deg north or south (cos(60) = 0.5). Since 500 mph is around the top speed at altitude for most civilian airliners, such jet would be able to keep up if it flew at around latitude 60 deg or more north.