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    Stellarium and the heavens in the 17th century
    From: R.H. van Gent
    Date: 2006 Nov 30, 13:47 +0100

    Nicolas de Hilster wrote:
    > Does anyone of you know Stellarium (http://www.stellarium.org/) 
    > and how accurate it is for long gone years? 
    > According to Stellarium on September 23rd, 1623 
    > (Gregorian calendar), Polaris had a right ascension 
    > of 00:26:32 and a declination of +87�16'41". Is this 
    > correct? 
    > I did check the solar eclipse as mentioned by Flamstead 
    > the Philosophical Transactions, number 55, page 1099 
    > (1669). He predicted it to be on April 9th, 1670, at 
    > 7:03pm (LON: 0�06'W, LAT: 52�57'N). After correction 
    > for the Julian calendar (10 days) I did see the solar 
    > eclipse on my screen. 
    > So it seems to work fine, but your opinion is much 
    > appreciated as well as other recommended software. 
    Stellarium is an interesting program - I like the option for displaying
    non-Western constellations - and I will certainly explore its other options.
    For free astronomical software I usually recommend Sky View Caf� at
    which has an amazing range of options and and features which are based on
    the algorithms in Jean Meeus, _Astronomical Algorithms_, 2nd ed.
    (Willmann-Bell, 1998).
    Robert van Gent
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