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    Re: sky display program.
    From: Guy Schwartz
    Date: 2006 Dec 12, 19:51 -0800

    I have Starry Night pro. It might do what you need. I'm willing to try.
    ----- Original Message -----
    From: "George Huxtable" 
    Sent: Tuesday, December 12, 2006 6:57 AM
    Subject: [NavList 1890] sky display program.
    > I'm enquiring about a suitable sky display program, to help with a
    > little research project into navigation history.
    > For that job, I need to display a picture of a small part of the
    > visible sky, plotted in altitude and azimuth, expandable up to (say) a
    > couple of degrees across the screen, with sky objects reasonably
    > precisely positioned for dates around 1700 AD, with errors no more
    > than 0.1 arc-minutes. I also need to know the coordinates of selected
    > objects in terms of (geocentric) ecliptic longitude and latitude, to
    > the same sort of precision, ideally with movable grid lines
    > corresponding to those coordinates. I need that display to show (from
    > a chosen geographic position) 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.
    > I have tried the program Skymap, which seems to fill the bill in every
    > respect but one. Although it provides alt/az, and RA/dec, it doesn't
    > display ecliptic lat/long. It provides a grid of ecliptic lat and
    > long, but only at 1-degree intervals, which is not good enough.
    > I know that I can calculate ecliptic coordinates from RA/dec, knowing
    > the obliquity of that date, but for this job it would be far more
    > convenient to have them displayed on screen.
    > I wonder if any NavList member has access to a sky-astronomy program
    > which they can recommend, as fitting those somewhat odd and demanding
    > requirements?
    > George.
    > contact George Huxtable at george@huxtable.u-net.com
    > or at +44 1865 820222 (from UK, 01865 820222)
    > or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    > >
    > --
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    > 12/11/2006 4:32 PM
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