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Re: Re: AstronomicalData - solar ecliptic longitude

Thanks, magma,   That's close. RA-Dec to ecliptic is not that tough. 

  - Kurt

    ----- Original Message ---- 
From: magma <maderri2 at> 
To: mathgroup at 
Sent: Sun, January 17, 2010 5:30:37 AM 
Subject: [mg106605] [mg106597] Re: AstronomicalData - solar ecliptic longitude

 On Jan 16, 12:11 pm, Canopus56 <canopu... at> wrote: > Mathematica 7 contains a new  powerful astronomical feature - AstronomicalData.  It appears to intended to partially supercede the outdated 1997 = _Scientific Astronomer_ package.  Is there a way by hour to tease out th= e current ecliptic longitude of the Sun from this function? 
> Thanks, Kurt        Directly from AstronomicalData does not seem 
so. You can get the RA and Decl of the Sun and then convert it to ecliptic long, if you know the formula.  For example:  AstronomicalData["Sun", {"RightAscension", {2010, 3, 21}}]  AstronomicalData["Sun", {"Declination", {2010, 3, 21}}]  give you the RA and Decl of the Sun next 21st March. As we can see we are very close to the first point of Aries 
>From this info you can get the ecliptic lat/long using the formulas d=
escribed in the wikipedia page below:
iptic_coordinate_system  hth         

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