Now Rukl's is out, how about Burhams?

0.7 degrees of RA is enough to make the difference between an object
being inside or outside the field of view, when one positions to it
with DSCs.

-Paul W.

On 15 Nov 2004 08:03:58 -0500, "William C. Keel"
wrote:

Chris L Peterson wrote:


I expect you would be hard pressed to distinguish between epoch 1950 and 2000
coordinates with mechanical setting circles, though!


50 years gives about 0.7 degrees along the ecliptic - so it might
just matter for great big setting circles. That fits with the
crude rule-of-appendage I heard long ago that precession gives
about an arcminute per year.

Bill Keel

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