الفهرس 
مقدمةيوجد فقط 14 صفحة متاحة للعرض العام
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المستخلص
Egypt was and continues to be a cradle for civilizations in many practical literary and scientific fields. Unlike the peoples neighbouring ancient Egyptians, who were primarily interested in astrology, the Egyptians were more interested in collecting and using astronomical data and information for more accurate calculations. Astronomy played a vital role in knowing the calendar, knowing the dates of holidays, the timing of agriculture and determining the three seasons of the year over the years.
The first calendar in the history of mankind was known in the forty-third century BC, The first calendar originated in the delta known for the vastness of its agricultural lands. The calendar is a time-based system, which man has developed according to (almost) established foundations and criteria to serve as a platform and guide for the history of his daily life events throughout the ages. The calendar represents a chronological record of the years and parts thereof based on one or more natural fixed phenomena and has been used by the human person to determine his time and to record the facts and events he circulates and witnesses in his daily life, whether those events are natural or human.
The ancient Egyptian has relied on the movement of some celestial bodies, such as the Sun, the Moon, the stars and the Sirius star, and one of the natural phenomena such as the Nile flood, which was the main reason for dividing the year into three seasons according to the nature of the agricultural cycle in ancient Egypt.