MattieShoes
MattieShoes t1_j27bwfe wrote
Reply to comment by Benjaphar in How fast does the Milky Way spin? How far does Earth move through space in a year? by Sabre-Tooth-Monkey
You can't see the photons going away from you. The only way to measure the speed of light is by round-trip -- ie. stick a mirror out there and let the photons come back, and measure round-trip time.
... but I'm sure you see where this is going -- if the speed outward was faster, the return trip will be slower, canceling out the difference.
Now, you could stick an observer out there to try and measure the transit time in one direction... but how do you synchronize your watches without relying on the speed of light? Well, you could sync them before moving apart, but the act of traveling apart will make time pass at different rates for you, so your watches instantly become un-synchronized. The equations you might use to cancel out this desyncing all rely on... the speed of light :-D
There's a fun video on it, lemme find it.
EDIT: found it! Veritasium
MattieShoes t1_ixvl77r wrote
Reply to comment by spankyb11 in Sunrise and sunset times throughout the year, arranged in a circle [OC] by imluke
Looks like a radar/spider chart/plot.
MattieShoes t1_ixvkw89 wrote
Reply to comment by gagarin_kid in Sunrise and sunset times throughout the year, arranged in a circle [OC] by imluke
Yes but no.
Yes it changes in theory, but not enough to notice.
That said, I'm neither an astronomer nor an astrologist.
MattieShoes t1_j5pl9bh wrote
Reply to comment by sillychillly in CEO pay has skyrocketed 1,460% since 1978: CEOs were paid 399 times as much as a typical worker in 2021 by sillychillly
> 350 largest publicly owned U.S. firms
Also significant... Lots of CEOs make very modest amounts -- they're just not CEO of the 350 largest publicly owned US firms.