Hi! As far as I know, also the VSOP87 has a temporal limitation and was derived to provide good results for about the years -4000...+8000. But I don't know the exact behaviour, i.e. how fast it diverges from nature beyond that range. Or can you please define "almost no limit"?
An improved VSOP solution with known behaviour and longer range of validity would be very fine, but also a connection (plugin/optional data file) with DE423 for the present, and any long-term variant for historical applications, would be fine! There was a DE408 that covers years -10000...10000 (I think) as extension of DE406, however it has not been formally published (?) Also, reference frames and Earth's rotational behaviour (DeltaT, obliquity, precession, nutation, ...) must all reliably fit together to make sense of the higher accuracy. Kind regards, Georg On Do, 10.05.2012, 09:38, JBerthier wrote: > On 05/10/2012 09:17 AM, Alexander Wolf wrote: >> Hi Jerome! >> >> 2012/5/10 JBerthier<[email protected]>: >>> If you are interested I can provide the files of coefficients of the >>> new >>> VSOP analytical planetary theory (Stellarium uses VSOP87 until now, >>> right?). But I'm not qualified to write any code for stellarium. The >>> advantage of an analytical theory is that there's almost no limit in >>> time. >> Yes, VSOP87 used by Stellarium until now and we interested to getting >> new coefficients for the new VSOP analytical planetary theory. Maybe >> we can get this files from ftp.imcce.fr? >> > > I'm not sure that it's already available on our ftp server. If not, I > will ask my colleague to put the files on the ftp. But as I used it, I > can send you an archive. > cheers, > jerome > > -- > --- Dr. Jerome Berthier ------------------ Phone: +33 (0)14051 2261 -- > Institut de mecanique celeste Fax: +33 (0)14633 2834 -- > 77 av. Denfert Rochereau Mailto:[email protected] -- > --- 75014 Paris - France --------------------- http://www.imcce.fr/ -- > > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > Stellarium-pubdevel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/stellarium-pubdevel > -- DI Dr Georg Zotti LBI ArchPro Franz-Klein-Gasse 1/III A-1190 Wien ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Stellarium-pubdevel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/stellarium-pubdevel
