Comment 10 for bug 490019

I find a quite good calculation (http://www.projectpluto.com/grs_form.htm) for the GRS and made a patch (see also comments in patch).
The patch is ONLY USED when ssystem.ini:
[jupiter]
rot_rotation_offset=0 # use JupiterGRS patch
rot_rotation_offset=80 # OK on 3/2015 but not constant over time and versions

After the patch you can verify the GRS at
2015-02-26 23:07 UT on picture at https://maximusphotography.files.wordpress.com/2015/03/jupiter-febr-26-2015.jpg
2014-02-25 19:03 UT http://www.damianpeach.com/jup1314/2014_02_25rgb0305.jpg
2013-05-01 10:29 UT http://astro.christone.net/jupiter/jupiter2012/jupiter20130501.jpg
2012-10-26 00:12 UT at http://www.lunar-captures.com//jupiter2012_files/121026_JupiterGRS_Tar.jpg
2011-08-28 02:29 UT at http://www.damianpeach.com/jup1112/2011_08_28rgb.jpg

Stellarium was 2h too early at
2010-09-21 23:37 UT http://www.digitalsky.org.uk/Jupiter/2010-09-21_23-37-30_R-G-B_800.jpg

It is correct since 4 years!!! And hopefully some yeas in the future too. ;-)

For me it is important to have a GRS at the current time, historic would be nice too, but not important.