a specification is made on the features needed in such a program.
an evaluation will be given of the accuracy reachable with present theories.
a sensitivity analysis will be made with regard to:
    azimuth/altitude accuracies of normal celestial events
    local time/location/declination accuracy with regard to solar eclipses/occultations
    set/rise events
a benchmark will be proposed to check planetarium computer programs
an evaluation of some 20 computer programs
and of course I want to thank people who helped me with this!