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It is essential to own an uhr as time plays such a pivotal role in our lives. The inception of mathematics has been attributed to the need to study time, particularly for the purpose of recording sequences of events. Timing the seasons is crucial for the successful growing of crops as one needs to know when the rains will come, when will rivers flood…etc. Knowing the length of the year is vital, not just the daily passage of the sun or the monthly phase of the moon. It is essential to know the length of a year, and it cannot be measured easily with sky timekeepers, the sun and moon. The earliest evidence of human timekeeping dates to 20,000 years ago in the forms of markings made on bones and sticks in Europe. The markings are understood to have been recording the days between each new moon.

For the Egyptians, it was essential to have a complete awareness of when the Nile would flood thus this event played a large role in shaping their calendar. The earliest found ancient Egyptian calendar is thus based around this event. From 4236BC, the calendar changed slightly, the year beginning with the heliacal rising of Sirius.