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moocher

If I want to ride off into the sunset on a horse, how fast do I need to ride for that sunset to never end?

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owl in reply to @moocher

Finally, someone asking the important questions on here.
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seb1977 in reply to @moocher

https://space.stackexchange.com/questions/27191/how-to-calculate-the-speed-of-rotation-of-a-given-point-on-the-earths-wgs84-ell

tldr it depends on..
tldr maybe too fast to enjoy it
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grams in reply to @moocher

You'd be trying to outrun The Terminator (not that one). It varies with latitude and at the equator it moves at 463 m/s = 1035 mph.

This page has a formula:

463.8212 * cos(lat) = velocity in meters per second

For London's famous London that's 638 mph.
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chez_jay in reply to @moocher

I think this is more difficult than it appears.

I'm fairly sure you don't need to go faster than about 184 m/s or 665 km/h.
According to the formula above, that's the speed of the day/night terminator (i.e. sunset) on the Arctic or Antarctic Circles, which by definition are the furthest latitudes through which the terminator passes every day.

[Edit: sunset is not instantaneous / the terminator isn't a sharp line, so you can probably trace a circle about 5 degrees inside your polar circle, and maybe go about 20% slower than that].

But is there a more optimal path..?