1. Kiddinu's value for the solar year is in use for today's calendars. 2. This put the country ten solar years behind the standard Muslim calendar. 3. This is because the solar year cannot be evenly divided into 24-hour segments. 4. Historically they were used to accurately determine the length of the solar year . 5. They also knew that five of these Venus cycles equaled eight solar years . 6. The Eblaite calendars were based on a solar year divided into twelve months. 7. The Lunar Year + 7 day week + 4 days = Solar Year . 8. In this way 19 Jewish years will be virtually equivalent to 19 solar years . 9. Nevertheless, the Roman calendar contained very ancient remnants of a pre-Etruscan 10-month solar year . 10. A common purely lunar calendar is the solar year approximately every 33 Islamic years.
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