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Posted by Michael McNeil on February 1, 2002 16:59:07 UTC

This link will take you to the page of the man who says he has found how to use a sundial to forecast earthquakes.

It requires patience and sunny weather. If you know of any schools that might consider copying the project, which only requires a south facing wall, here's what to do:

Place a gnomon to throw a shadow onto the wall. At the same time or times everyday mark out the point of the tip of the gnomon's shadow. Over an year it will form a figure-eight. The next year it will go the same figure-eight again. Provided the same time is used to mark the the shadow the points will be identical.

Where all else being equal the points do not match, there will be a quake in the vicinity. How near I don't know. Another problem with some schools is the likelihood of vandalism.

At the very least the kids get a graphic description of the equation of time; daylight-saving time; the original use of a sundial and the astronomy of callendars.

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