History of the sundial
From time immemorial Man must have realised that the changing length of the shadow of an object indicated the time of day - that the shadow shortened towards noon and lengthened again towards evening. No doubt the first crude sundial consisted of no more than a vertical stake in the ground. Eventually Man must have realised that the changing length of the shadow could be used, probably with stone markers, in the same manner as we use the hands of a clock today. This notable step forward in Man's attempt at measuring time was at least 3,500 years ago as the earliest known sundial, found in Egypt, dates from that time.
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