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    Re: sky display program.
    From: Dave Walden
    Date: 2006 Dec 13, 08:55 -0800

    Perhaps Xephem will meet your needs.
    
    For that job, I need to display a picture of a small part of the
    visible sky, YES, CAN ZOOM plotted in altitude and azimuth,  YES, CAN
    CHOOSE ALT/AZ, OR RA/DEC expandable up to (say) a
    couple of degrees across the screen, YES with sky objects reasonably
    precisely positioned for dates around 1700 AD, with errors no more
    than 0.1 arc-minutes. PROPER MOTION DATABASES AVAILABLE WILL GIVE HIGH
    ACCURACY I also need to know the coordinates of selected
    objects in terms of (geocentric) ecliptic longitude and latitude, THIS
    ONE ELIMINATES MANY OPTIONS, BUT XEPHEM HAS A TOOL THAT LETS YOU POINT
    TO ANY OPJECT IN VIEW AND READ OUT RA/DEC@2000,  OR CHOSEN EPOCH,
    ALT/AZ, GALACTIC LAT/LONG, OR ECLIPTIC LAT/LONG to
    the same sort of precision, TO 10TH OF SECOND ideally with movable grid
    lines
    corresponding to those coordinates. SORRY NO ECLIPTIC COORD GRID I need
    that display to show (from
    a chosen geographic position) GOCENTRIC OR TOPOCENTRIC a precise view
    of the Moon, at its
    correct diameter, and with its shadow-terminator rigorously calculated
    according to the actual positions of Sun and Moon at that moment.
    TERMINATOR IS SHOW
    
    
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