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Re: OFFLIST: Galactic Year: (was: Re: Reviving an old tradition)

From:Mark J. Reed <markjreed@...>
Date:Saturday, February 11, 2006, 20:37
This wasn't actually offlist, btw.

On 2/11/06, tomhchappell <tomhchappell@...> wrote:
> >>The time it takes for the galaxy to revolve once about its axis. > >>Some hundreds of millions of years, I forget exactly. --larry >
> You could define a "galactic year" as the length of time it takes > _our_ star to revolve around _our_ galaxy's center.
That is, indeed, the correct definition, and the one I forwarded. Henrik was merely (perhaps over-)simplifying. The lyric is "We go 'round every two hundred million years", which is a bit low by modern estimates. Of course, we've also adjusted our estimate of the number of stars in the galaxy upward by a factor of a thousand since that was written, but fortunately dropping "billion' in for "million" is a scansion no-op. :) -- Mark J. Reed <markjreed@...>