; sky_off.sfa - Thomas G. Ferguson, Abrams Planetarium, March 2002
; This file erases the night sky.

0:00 buttons 2,1 play ./sky_on
     buttons 2,1 label 'Sky   On'
     declare global stars
     declare global milkyway
     declare global M31
     declare global M42
     declare global MagClouds
     adjust stars brightness 0 /until +2
     adjust milkyway brightness 0 /until +2
     adjust M31 brightness 0 /until +2
     adjust M42 brightness 0 /until +2
     adjust MagClouds brightness 0 /until +2
     play /dsuser/french/buttons/solar_off
0:02 erase stellar stars
     erase galactic milkyway
     erase galactic M31
     erase galactic M42
     erase galactic MagClouds
     end