Cirrostratus (layered stratus) appears to be the right density and altitude (in this function, as a distance from the observer), to create a halo made of frozen vapor, an optical illusion.
Time-lapse length (30 fps):
13 seconds and 17 frames.
…sets with Cirrus clouds moving overhead. Cirrus clouds, a thin layer of water 40,000 or so feet in the sky, pass quickly by with motion-blur due to the long exposure, which allows the illumination of the moon to be magnified on the desert vista below. Since it is so far below, the Canyonlands view stretches a vast distance, and the many stars of the night sky move as the Earth spins, and the moon with it, towards the horizon and out of the clouds.
Time-lapse length (30 fps):
8 seconds and 11 frames.
… and their small lights ascending before dawn. Multi-categorized clip. The moon sets behind Mt Rainier. Looking closely afterward, a distant, single climbing party’s headlights are shown ascending the rugged and impressive slope overnight. Morning comes, a blue hour, and far, far behind some conifers, the snow of the mountain becomes pink momentarily against the rapidly changing sky, until the sky is light blue, and it is day again.
Time-lapse length (30 fps):
38 seconds and 4 frames.
The vast Crater Lake is under heavy rolling low clouds that part for the moonlight to briefly shine on the water and allow the few stars visible to shine through.
Time-lapse length (30 fps):
10 seconds and 26 frames.
The continuation of another clip.
Time-lapse length (30 fps):
22 seconds and 7 frames.