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Calendar<br />

The famous Aztec calendar can be read in terms of cycles covering thousands of years.<br />

Reproduced by permission of Fortean Picture Library.<br />

Origins of <strong>the</strong> Calendar<br />

There are three natural divisions of time on Earth. The most obvious is <strong>the</strong><br />

alternation of night and day, and all calendars are organized in terms of <strong>the</strong> 24-hour<br />

day, which is <strong>the</strong> approximate average length. However, not all calendars are organized<br />

in terms of hours with a fixed length. Our ability to measure seconds and even<br />

minutes accurately was achieved only in modern times. A medieval sundial divided<br />

[108] THE ASTROLOGY BOOK

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