; equator_on.sfa - Thomas G. Ferguson, Abrams Planetarium, March 2002
; This file draws the standard equator.

0:00 buttons 2,12 play ./equator_off
     buttons 2,12 label 'Equatr   Off'
     declare global equator
     declare global meridian
     adjust equator def ibid meridian
     att in 0 90 0/o equator
     adjust equator brightness 0
     draw galactic equator
     adjust equator brightness 100 /until +2
     end