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Re: pic: VEX Solar Tracker Gearbox
Quote:
Originally Posted by billbo911
... The sun revolves around the earth at almost exactly 1rpd. ...
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Quote:
Originally Posted by MWB
... Doesnt the Earth revolve around the Sun? ...
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Quote:
Originally Posted by billbo911
... the Earth does rotate around the Sun and it also rotates on it's axis. ...
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Billbo - Don't cave in so quickly 
The motion(s) can be described from any arbitrarily chosen reference point; so the Sun, along with the rest of the universe, does revolve around the Earth.
Also, if you want to describe the Earth-Sun situation as a two body system (and ignore all the other influences on their relative motions) you will often (but certanly not always) choose to say that the two bodies move relative to a point that is in-between their centers-of-gravity, not around the center-of-gravity of the larger mass.
So, out of the choices so far, I think the original statement involved the fewest approximations.
This opinion, when combined with $1.50, can be exchanged for a soft drink from the nearby machines. 
Blake
__________________
Blake Ross, For emailing me, in the verizon.net domain, I am blake
VRC Team Mentor, FTC volunteer, 5th Gear Developer, Husband, Father, Triangle Fraternity Alumnus (ky 76), U Ky BSEE, Tau Beta Pi, Eta Kappa Nu, Kentucky Colonel
Words/phrases  I avoid: basis, mitigate, leveraging, transitioning, impact (instead of affect/effect), facilitate, programmatic, problematic, issue (instead of problem), latency (instead of delay), dependency (instead of prerequisite), connectivity, usage & utilize (instead of use), downed, functionality, functional, power on, descore, alumni (instead of alumnus/alumna), the enterprise, methodology, nomenclature, form factor (instead of size or shape), competency, modality, provided(with), provision(ing), irregardless/irrespective, signage, colorized, pulsating, ideate
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