The patch 0.980e, adds planet ephemerides to SE 0.980. Link to the news and download:
http://spaceengine.org/news/patch0980e/
Minor bug - typo in the Solar system catalog file, resulting in a wrong rotation period of Saturn (4 hours). To fix it:
- Extract SolarSys.sc from <SE folder>/data/catalogs/Catalogs0980.pak: (it is a renamed zip archive, so you can use winrar or 7z or whatever). Save extracted file to this path (create folders manually):
<SE folder>/data/catalogs/planets/SolarSys.sc
- Open the file with notepad, find Saturn script, find RotationModel "IAU", and replace this line
RotationRate 1810.7939024 // degrees/day
with this one:
RotationRate 810.7939024 // degrees/day