[Kstars-devel] Re: kstars engine?

[karinqe]

Thanks, now it finally makes sense how kstars can be so quick. This is
the kind of info I was searching for.

Thank you very much!
Karinqe

On 1 October 2010 23:22, Daniel-Marian Baboiu <daniel.baboiu at shaw.ca> wrote:
> Applications like kstars do not "solve" the n-body problems. This part
> is part is done numerically by large computing centers like JPL and made
> available to the public in the form of series with thousands of terms
> (do a search "JPL ephemeris").  Based on this full integration, other,
> more compact series can be obtained, such as VSOP87 and Swiss Ephemeris.
> A subset of the VSOP87 is presented in Jean Meeus - Astronomical
> Algorithms, which is more of a cookbook than a book on celestial mechanics.
>
> For relatively short time intervals, the n-body problem can be solved
> approximately using the perturbation theory - the main term is that of
> the Sun, so the orbit is elliptic, while the influence of the other
> bodies is to slowly change the orbital elements. Anything more than this
> is beyond the scope of the list, but you can contact me on my private
> address.
>
> Daniel Baboiu
>
>
> On 10/01/2010 01:34 PM, karinqe wrote:
>> Hi,
>> is there any info about the algorithms the engine uses to predict the
>> motions of planets? How do you "solve" the N-body problem? How precise
>> is it? What do you take into account?
>> I'll look into the code later for more specific information, but now
>> I'm just trying to find out which algorithms are often used in
>> applications like kstars and don't have enough time to search in the
>> source :(
>> Could you please give me some hints?
>>
>> (I'm doing a Bachalor's thesis on the N-body problem...well, at least
>> I'm starting)
>>
>> Thanks in advance,
>> Karin
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>>
>>
>
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