Use of okeefe-ring add-on

Step 1.

In this package is a file called jpleph.dat.  Drop this file into the celestia/data directory.   


Optional Remark:  For further explanation of what you are doing, see
http://en.wikibooks.org/wiki/Celestia/JPL_Ephemerides.  Note however, that the wikibooks explnation is a bit out of date.  In particular the URL provided therein for JPL ephemeris does not work.  To download yourself from scratch, see instead, 
ftp://ssd.jpl.nasa.gov/pub/eph/planets/SunOS/de406/
Choose the epoch you are interested in, download it, rename it jpleph.dat, and drop it into the celestia/data folder.


Step 2.

In this package is a folder called okeefe-rings.  Drop that into the celestia/extras folder.

Optional Remark:  That's really all you have to do.  In order to fill up more space, let me tell you that what you're doing is adding to the Earth two rings, comprising a first draft of John O'Keefe's ring system.  

- He said in 1980 the Earth might have a ring like Saturn's.  That would be a ring in the equatorial plane.  So we've got one of those.  
- He did not suggest a ring in the plane of the lunar orbit, but surely that is ONLY because no such ring had ever been observed in the solar system as of 1980.  Saturn's Phoebe ring having been recently discovered, this system here has one of those also.  Had O'Keefe known of such a ring he would certainly have thought the Earth might have one.   It is a ring in the plane of the lunar orbit, and orbiting the earth-moon barycenter (many many thanks to Chuft-Captain for provision of an example of how to do that in Celestia).  It is made of tektites, but you may disbelieve that and come to no harm.  It would be more realistic to have the Phoebe ring fatter, comprising orbits in a range of tilts from the instantaneous one.  But for now, it's flat.

- Lucy O'Keefe Hancock