In addition, another 360 days calendar of 12 months 30 days each was also in use. Three hundred and sixty is easier to divide and compute and it is an average between the solar and the lunar year: 365.24 (solar
) + 354.38 (lunar
) AVERAGE = 359.81, nearest integer: 360
, which is a highly composite number.
- 360 is the smallest number divisible by every natural number from 1 to 10 except 7.
Turning back in the past, we find the 360 day calendar in the biblical account of the flood were 150 days are equal to five months. (5x30=150; five lunar months should be slightly shorter). The method used at that time to fill the gap between the lunar and the solar years is unknow.Antediluvian
There are already trace of a 360-day calendar in the Biblical account of the flood were 150 days are equal to five months. (Five lunar months should be slightly shorter). The method used at that time to bridge the gap between the Moon and the solar years is unknown.Sumerians
Robert K. Englund, Ph.D., professor of Sumerology at UCLA, says in the Journal of Economic and Social History of the Orient, 1988, pp. 121-122 " The calendar and the sexagesimal system have an old relationship…The sexagesimal system of counting … is attested throughout the third millennium ... [The calendar] is attested in its basic form of a twelve-month period, and 360 days year, in archaic documents of the late 4th millennium [BC]." This is probably the origin of the circle divided into 360 degrees.Egyptians
Herodotus wrote in his stories: “The Egyptians were the first to discover the year and to divide it into twelve parts. They obtained this this knowledge by studying the stars. The Egyptian calendar seems to me to be much more sensible that that of the Greeks; for the Greeks, to make the seasons work out properly, intercalate a whole month every year, whereas the Egyptians, basing the calendar on twelve thirth-day months, (360) intercalate five additional days every year, whereby the cycle of the seasons returns with uniformity.” Babylonians
The Babylonians, although the finest astronomers used a lunisolar cycle very similar to the Hebrews. They probably synchronized it with the equinox. They are the inventors of the 19-year cycle, later called Metonic, to anticipate the 13th additional months. Respectively, the year 3, 6, 8, 11, 14, 17, and 19 were those with 13 months. During their exile in Babylon, the Hebrews adopted these methods and also the names of the Babylonian months.Maya
Their tun was a year of 360 days. Twenty tun equaled a katun and twenty katun equaled a baktun which is equal to 144,000 days, so 400 x 360 days. Also if they had different and interrelated calendars; to identify a real date in history they used the 360-day calendar.Aztecs
The Encyclopedia of Time, p. 49, said of the Aztecs, "they had different and complex calendar systems ... they have nonetheless continued to pay tribute to a year of 360 days.Indians
The Indo-Aryan encyclopedia G. Thibaut, says: "The Vedas speak uniformly and exclusively of a year of 360 days. The passages where the length of the year is directly stated are found in all the Brahmana’s .. "In addition, the Vedas contain four ages, such as the Golden Age, the Silver Age, each of which are divisible by 360. The silver age (Treta Yuga) is 360 * 3600 years long.Persians
The Zoroastrian calendar year was of 12 months of 30 days, plus five days. It became official under the Sasanian dynasty, from about C.E. 226 until the Arab conquest in 621. The Arabs introduced the Muslim lunar year, but the Persians continued to use the Sasanian solar year, which in 1079 was made equal to the Julian year by the introduction of the leap year.Greeks
Herodotus wrote "These seventy years represent, excluding intercalated months, 25,200 days" so using this calculations, a year would be of 360 days. 25,200 / 360 = 70
The Antykithera mechanism shows not only that the Greeks managed to create a "clock" that can predict the Metonic cycle, and also eclipses! Romans
The life of Plutarch's Numa explain: “they had been irrational and irregular in their fixing of the months, reckoning some at less than twenty days, some at thirty-five, and some at more; they had no idea of the inequality of the annual motions of the sun and moon, but held to this principle only, that the year should consist of three hundred and sixty days
For more informations about the use of 360 days calendars in ancient history, follow the linkhttp://www.webexhibits.org/calendars/calendar-ancient.htmlModern 360-day calendar
Today 360 is still used in financial markets and in computer models. In France this year is still called Lombard year in memory of Lombardy bankers who in the Renaissance use this calendar to simplify their divisions in their interests rates.Beauty of 360
This fascination through millennia of 360 takes us to explore its beauty a little more closely. By dividing or multiplying by 2 we continuously obtained the same digital root of 9: 3 + 6 + 0 = 9; 1 + 8 + 0 = 9; 9 + 0 = 9; 4 + 5 = 9; 2 + 2 + 5 = 9; 1 + 1 + 2 + 5 = 9; etc ad infinitum.
The sum of the angles of regular polygons, derivatives division 360⁰ produces the same result: 180 ° 360 ° 540 ° 720 ° 900 ° 1080 ° 1260 ° 1440 °.
This property is the one of the number 9, number highly mathmagic that produces this result in every one of its multiple and continuously when we divide it by 2.