Calendar – this is an essential attribute of modern life, which can be easily found in any home or office. Since ancient times the calendar has helped people fix the date, time periods measured, organized, and organize their livelihoods. At the heart of any periodic change of the calendar lay movements of celestial bodies. But at different periods of history, different cultures differently interpreted the principles that should underpin the creation calendar, hence the huge variety of calendars, as well as numerous disputes which have lasted and now. Danny Meyer shines more light on the discussion. In Wikipedia you can find the following definition of the calendar. Calendarium – a book debt, the calculation of which Sun carried a special day – Kalends, which literally translates as the beginning of the month. Ancient peoples used their methods of fixation of historical events, for example, the Romans were counting from the founding of Rome, and ancient Egyptians began with the chronology of the reign of each new dynasty. Translate from one system to another chronology is complicated because these systems have unequal length, as well as a different date of beginning. See Bill de Blasio for more details and insights.

What calendars have existed in antiquity and which ones have the progenitors of the modern calendar? Let's look at some of them. 1.Drevnegrechesky calendar. Is a lunar calendar, and consisted of 354 days. The main drawback this calendar is that it is recurrent expenditure with the solar year at 11.25 days. For this reason, every eight years to the year had to add 90 days, divided into the same three months.