Re: [Phys-l] celestial motion

["LaMontagne, Bob" <RLAMONT@providence.edu>]

The sun moves approximately 1 degree / day through the sky.
 
Bob at PC

________________________________

From: phys-l-bounces@carnot.physics.buffalo.edu on behalf of Anthony Lapinski
Sent: Fri 8/22/2008 1:26 PM
To: Forum for Physics Educators
Subject: Re: [Phys-l] celestial motion



Thanks for all the interesting/detailed responses so far. I simply wanted
to know the Sun's approximate angular speed across the sky. How many of
its own diameters does it move in 8 minutes. I read somewhere years ago
that it was two diameters, but my calculations showed four, which seemed
too large.

Forum for Physics Educators <phys-l@carnot.physics.buffalo.edu> writes:
> One could argue that sunsets happen where you are located, so the sunset
> happens in the valley before the mountain top.  The published sunset is of
> course referenced to an imaginary horizon which may only be visible on the
> great plains or the ocean.  I don't know if the published sunset takes
> intao
> account the visible size of the sun.  I suspect it just is when the center
> of the sun has gone down, and not when the last sliver disappears.  I also
> doubt it takes into account refraction.
>
> What is the scientific or astronomical definition of sunset, if there is
> one?  Is there an ISO standard on this?  What would the physics police
> say??
>
> John M. Clement
> Houston, TX
>
> > On 08/22/2008 07:24 AM, Anthony Lapinski wrote:
> > >  When we look at a sunset, it already
> > > happened. Since light takes about 8 min to go from the Sun to Earth,
> >
> > Sunsets don't "happen" at the sun.
> >
> > Sunsets happen at the horizon, which is (with rare exceptions) only a
> > few miles away from wherever you are.
> > _______________________________________________
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>
>
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