EOS Camera

Sky brightness of every frame (log₂: one stop is twice the light). Dusk and dawn are the slopes at each end; cloud shows as a bump. The star-trail stack uses only frames within 30% of the darkest 10 minutes, so twilight and cloud are left out of it. Left out is not thrown away: those frames still go into the videos.

The raw night: a 10 minute stack sliding on 1 minute per video frame. Dusk, cloud, aircraft and dawn all show here, five seconds for the whole night. · full-res

The brightest value each pixel reached all night: every star draws its trail across the night.