Darryl Ramm wrote:
/snip/
One of the problems we've seen is that there is really no such thing
as an "official" sunset time, just times calculated from astronomical
tables/snip/
Mike

It may be semantics but the problem some pilots run into is there is
*exactly* a precise definition of sunset time, it's just too bad it
might be different from what they observe /snip/
Darryl

I have run into a definition of sunset that used to go like this:
"The time at which the trajectory of the Solar center is six degrees
below the local horizon."

You can see how this could vary when the horizon is the Rockies, versus
five miles West where it might be 5000 ft lower...

Brian W