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    Re: Stellarium and the heavens in the 17th century
    From: Nicol�s de Hilster
    Date: 2006 Nov 30, 18:30 +0100

    On my question regarding experience with Stellarium [NavList 1793] 
    Robert wrote:
    >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
    >  http://www.skyviewcafe.com/
    >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).
    So I downloaded the program and installed it.
    About Polaris I asked:
    >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 
    and now I found as an answer a small difference in Polaris between the 
    two programs of 23 arc-seconds in declination (87�16'18" vs 87�16'41") 
    and 2 seconds in right ascension (00:26:32 vs 00:26:34), which is not 
    too bad given the accuracy of period instruments, which was the reason 
    why I wanted to know Polaris' position. I guess I can rely on the 
    average figures.
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