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If you asked the average person to write a list of the most important things for him on a tour of his daily activities, mostly it will not include a notebook or newspaper to determine "today 's date." Although it is in every age it appeared civilization, old were or modern, was to determine the date systems and calendar tools are things that can never be dispensed with.
Time calendars used today are the product of many centuries of tireless and continuous experiments based on trial and error of the study. When people began to observe celestial bodies as a means of measuring time, they noticed that the sun seems to constantly moving in the sky are constantly repeated in the trip, I always return to the same place where it began after a certain number of days. (In fact, of course, that the earth is that the annual cycle around the sun, but look for an observer from the surface of that session as if the sun is doing frequent trip in the sky). They also observed that the moon does its own cycle takes fewer days.
Most of the early calendars were based on the cycles of the moon. We have been the work of those calendars to fit in as best they can within the broader framework of the solar cycle (solar year). The Sunnis, in the lunar calendar, generally consisting of a dozen cycle of the moon or rather twelve months. Since the sum of twelve lunar cycle is not quite equal to the solar year, the extra month - called Almqahm month, or inserted - is added to the calendar from time to time. A number of ancient peoples relied on this method in the calculation of time, it has included the Babylonians and the Hebrews, Greeks, and Romans.
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