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Cultural aspects in Christian and Islamic religions - unesdoc - Unesco

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22<br />

Calendars, their<br />

Mean<strong>in</strong>g <strong>and</strong> the<br />

Reason why they<br />

are Used<br />

The rotation of the moon around the earth <strong>and</strong><br />

the rotation of the earth around the sun provided<br />

people with the possibility to calculate time <strong>and</strong><br />

to divide it <strong>in</strong>to years, seasons, months, days, <strong>and</strong><br />

hours. The rotation of the moon around the earth<br />

provided the rhythmic <strong>and</strong> clearest visible means<br />

to determ<strong>in</strong>e months. Yet, people noticed that<br />

twelve lunar rotations do not necessarily co<strong>in</strong>cide<br />

with the solar year s<strong>in</strong>ce they only <strong>in</strong>clude 354 days<br />

<strong>and</strong> 8 hours whereas the earth needs 365 days<br />

<strong>and</strong> 6 hours approximately to revolve around the<br />

sun. This difference led to the sett<strong>in</strong>g up of two<br />

calendars: one solar <strong>and</strong> one lunar.

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