A book written by Theophrastus, a pupil of Aristotle, in 300 B.C. Book of Signs was one of the first written attempts to forcast weather by listing over 200 empirical rules or weather indicators that looked at natural signs such as the shape of clouds or the color of the sky.

Two correct rules:
Whenever there is fog, there is little rain.
A halo around the moon portends rain.

An incorrect rule:
Wind blows in the direction of shooting stars.

Though not all of these empiricisms were correct, this book had a lasting influence over the next 2000 years.

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