Geoname files/trail starting times

Bill J Gray Aug 30, 2002

James, you're probably thinking of geonames.dat, in the GEO
directory. You _can_ play around with this (the format is the same
as that of the 'egeo_err.dat' file), but it shouldn't be necessary to
do so.

About starting planet/satellite/asteroid trails at "standard" times,
such as midnight UT or local midnight: I did want to keep the flexibility
in this, so that people who regularly observe around 20:00 in the
evening could get ephemerides and trails for that time.

In reference to this: At some point, I want to add the concept of a
"solar altitude day": instead of advancing exactly one day, Guide
would advance to the time on the next day where the sun is at the
same altitude. Thus, if you were showing an evening sky with the
sun at altitude -9 degrees, you could advance by one "solar altitude
day" (SAD?) to the time on the next evening when the sun was at the
same altitude. This would apply for animation, trails, and ephemerides.

-- Bill