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NASA needs your smartphone during April's solar eclipse
(www.popsci.com)
This is a most excellent place for technology news and articles.
Inertia is the tendency of objects in motion to stay in motion, and objects at rest to stay at rest, unless a force causes its speed or direction to change.
from WikipediaSo they're kind of just saying that once it picks up enough rotational speed.
Thank you! I appreciate it. I had a hunch they were sloppy with the term "inertia", and this confirms it for me, assuming I'm understanding it correctly.