On Sat, Mar 18, 2006 at 11:50:48 +0300, Oleg Bartunov <oleg@xxxxxxxxxx> wrote: > I may be wrong but we in astronomy have several sky indexing schemes, which > allows to effectively use classical btree index. See > http://www.sai.msu.su/~megera/oddmuse/index.cgi/SkyPixelization > for details. Sergei Koposov has developed Q3C contrib module for > PostgreSQL 8.1+ and we use it with billiard size astronomical catalogs. Note that Earth Distance can also be used for astronomy. If you use an appropiate radius, distances will be in degrees.
