Photo Agency - Astronomy - Space - Nature
> The Moon and sixty - Artist view
The Moon and sixty - Artist view
author: Space Channel/Novapix
reference: a-cad98-00001
Image Size 300 DPI: 25 * 25 cm
Sixty, not ten, was the basis of Sumerian math. The Sumerian calendar, the farming 'tool-kit', was based on the phases of the Moon; 12 x 29.5 days. This produced a year equal to 360 days; a reasonable approximation, but not accurate over time. Every so many years an extra month had to be added, and an incredibly complex math system was used to make the adjustment.
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