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- Wed Aug 15, 2007 12:42 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Discussion of APOD 15 August 2007: Mysterious Streaks
- Replies: 97
- Views: 79797
40 minutes?
Multiple possibilities: 1. It is 40 seconds, not minutes. Using a short enough focal length, no star trail should be visible. which is the case. 2. It is 40 minutes, unguided. Then we would observe star trails. 3. It is 40 minutes guided, then the trees would be blurred. 4. It is 40 minutes guided a...