Calendar What Timetable?

In the West, we tend to think that there is only one calendar, but there are dozens of them around the world. Governments have given up their old national calendars, traditional, but in general the rural population still use them, even if they can not obtain a printed version. Lunar Calendar - It seems that primitive man used marks on the bone to follow or indicate the passage of time 25,000 years ago, probably calibrated the phases of the Moon A schedule can be developed based on lunar cycles; it produces a year of twelve months (the word "month" comes from the word "moon"), but only 354 days, eleven short time it takes the Earth to orbit the Sun. The Chinese still use a version of Lunar Calendar but they solve this problem by adding extra butterflies every now and then to "time" back in alignment with the sun

solar calendar - The ancient Egyptians were the first to use a solar calendar, but it could rightly be called a stellar schedule. The new year began for them when Sirius, the Dog Star, the brightest star in the night sky, rose in the same place as the Sun This habit coincided with the Nile flood. This calendar was 365 days; twelve months of thirty days and five days of celebration. Scientists have been working for this calendar was taken up in both 4241 BC or 2773 BC.

Julian Calendar - In 46 BC, Julius Caesar noticed that several provinces of the empire were using different calendars, so he ordered the dating system to be unified.
 
Sosigenes came with a 365-day calendar, with an extra day every four years. So, in 46 BC, the longest record year, Caesar added days a year to bring it into alignment with the seasons. 46 BC was 445 days long! The vastness of the Roman Empire has ensured that this calendar was the defacto calendar of the Western world.

Julian Day Count - In 1582, Pope Gregory XIII to be put into a new calendar, but a year after Joseph Justus Scaliger introduced a system of days, not years. It begins with 1, January 1, 4713 BC. To date, the Julian and lunar calendars and the tax system dating from Roman coincided everything; something that will happen in the next 3267. January 1, 2001 was 2,451,913 Julian day

Gregorian calendar - at least 730 AD, it was discovered that the vernal equinox of the year at the spring equinox was short of 365.25 days in a year.
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