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I have Starry Night pro. It might do what you need. I'm willing to try.
Guy

----- Original Message -----
From: "George Huxtable" 
To: 
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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>


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