&#169 O.Hainaut / ESO-Chile (1992)</i><br>
&#169 O.Hainaut / ESO-Germany (1993)</i><br>
&#169 O.Hainaut / K. Meech -- IfA/UHawaii and TOPS Workshop (1997)</i><br>
&#169 O.Hainaut / ESO-Chile (2001)</i><br>
&#169 O.Hainaut / ESO-Germany (2020)</i><br>

<p>This program was originally written in Fortran, using  SuperMongo for the graphics (SM, by Robert Lupton and Patricia Monger, <a
href="http://www.astro.princeton.edu/~rhl/sm/">http://www.astro.princeton.edu/~rhl/sm/</a>). It has been re-written from scratch using Python and matplotlib, resulting in (even) nicer graphics and much lighter code...

<p>The observatory and city list comes mostly from that included in
XEphem, the great interactive astronomical ephemeris program for
X-Windows, <a
href="http://www.ClearSkyInstitute.com/xephem">http://www.ClearSkyInstitute.com/xephem</a>
ecdowney@ClearSkyInstitute.com, with personal additions and deletions.
Any errors in the current list is mine. 

<p>Several subroutines come from "Astronomical Formulae for Calculators"
by Jean Meeus. Richmond, Va., U.S.A., Willmann-Bell, (c) 1982.