"Things You Wouldn't Know If We Didn't Blog Intermittently."
The shadow of the moon can be seen darkening part of Earth. This shadow moved across the Earth at nearly 2000 kilometers per hour...
This was the crux of a mystery story written by Isaac Asimov for his Tales of the Black Widowers series. It was called "The Backward Look."
Here it is -http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=5&cad=rja&uact=8&ved=0CDgQFjAE&url=http%3A%2F%2Fwww.ebooktrove.com%2FAsimov%2C%2520Isaac%2FAsimov%2C%2520Isaac%2520-%2520Black%2520Widowers%2520-%2520The%2520Backward%2520Look.pdf&ei=nhtTVPyIFtD5yQS68oDwDA&usg=AFQjCNHPF-qYyPwHmgcr6teh3iBnzotPkw&bvm=bv.78677474,d.aWwThough it seems to me more a science lecture than a sci-fi story.