How fast are you moving when you're sitting still? Though it seems we are at rest here on earth, each instant we are drifting through space at mind boggling speed. Since the speed is constant (no acceleration), we don't "feel" it.

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Please remember that 800 km/s is only an approximate value. As science devises new techniques to correct the velocities to more precision, the value might vary. But it wont be too far from 800 km/s.
The important thing is to understand that we are not at absolute rest.

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Narrator:
Claudio Napoleoni (http://www.cnvoiceovers.ca/)

References:
http://www.astrosociety.org/edu/publi...
http://arxiv.org/abs/astro-ph/9312056

Soundtrack:
The Complex - Kevin MacLeod (incompetech.com)