# The twilight handoff (equinox sweep): the run boots at game hour 6
# (dawn twilight: el -0.6, the twilight sun already lit) and sweeps
# through noon (el 37.7) into the dusk: the wall crossfade at el 16-14
# (~frames 3050-3120), the twilight sun rising as the true sun sinks
# (reg el 46 at el 8.6, 61 at el -0.7), the lamps igniting through
# true sunset (gas 0.78 at el 0.9, full at el <= 0), the blue hour
# (b > r from el ~-3), and the burnout at el -8 (~frame 3825).
# frames: 4400
