Night.2
Actual Elapsed Time: 12 hours (43,200 seconds)
Stars seem to rotate in the evening sky. What's really happening is that you are seeing the effect of the Earth's rotation about its axis. Normally we canŐt see the effect of this rotation (and we certainly can't feel it) but by speeding up the action nearly 5,000 times normal speed, the apparent motion becomes clear. The direction you (or the camera) look can greatly affect how the sky changes over time. In this animation, we are looking towards the North Star. If we were looking more towards the southern horizon, the stars would seem to streak straight across the sky (not in a circle as in this video).
How This Clip Was Made:
This animation was created by combining a photograph of the night sky and astronomical data. The positions of the stars were animated over time, then the image of the night sky was blended into the animation. Animator: Bob Hone. Post-Production: Bob Hone.
Related Clips:
Night.1 - Actual Elapsed Time: 2.8 hours (10,000 seconds)
Night.3 - Actual Elapsed Time: 1 year (31,500,000 seconds)
