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Still doesn't mesh with the colloquial "nearly". :(

antilog scale

You might say that "nearly" is used in a ... relative sense.

(boom tish)

I think your sun speed should be km/h? Every website has a different figure, but they mostly seem to be around 500,000 miles/hr ~ 800,000 km/h.

Yeah missed that, thanks. 536,000mph

Those two numbers are actually closer to each other than I expected.

Where they become important depends on your precision of measurenment. GPS satellites don't move at 2% the speed of light, but relativistic effects do play a role for the system to work since they need to be very precise in measuring and broadcasting time.