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Science

Thor_MN

(11,843 posts)

4. The exposure can't be too long...

Reply to msongs (Reply #1)

Wed Nov 22, 2017, 11:12 PM

Nov 2017

The ISS orbits the earth every 92 minutes, so a very long exposure is not possible.

Daylight exposures can be "snapshots" with shutter times like 1/500th of a second. Nightside exposures require longer shutter times and the use of a device to pan the camera at the moving earth.

The point is the contrast between land and sea. Urban and even some rural areas are much more lighted - light pollution.

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