CW talk:Kalenteri

Ajanlaskuun

• Viisi planeetta + aurinko
• kaksi kuuta
• 14 tähtikuviota (X määrä tähtiä)

--phooka 12:54, 11 May 2010 (UTC)

Auringon aika

• http://en.wikipedia.org/wiki/Maya_calendar#Tzolk.27in
• http://en.wikipedia.org/wiki/Aztec_calendar

Tarkalleen zeniitissä Aurinko voi käydä kääntöpiirillä vain kerran vuodessa: Kravun kääntöpiirillä kesäpäivän seisauksen aikaan ja Kauriin kääntöpiirillä talvipäivän seisauksen aikaan. Kravun kääntöpiirin pohjoispuolella tai Kauriin kääntöpiirin eteläpuolella Aurinko ei voi ikinä käydä aivan zeniitissä saakka. Kääntöpiirien välisellä alueella Aurinko on zeniitissä kaksi kertaa vuodessa, leveyspiiristä riippuen eri aikaan vuotta. 

#260-day cycle (Aztec & maya)
The tonalpohualli ("day count") consists of a cycle of 260 days, each day signified by a combination of a number from one to thirteen, and one of the twenty day signs. With each new day, both the number and day sign would be incremented: 1 Crocodile is followed by 2 Wind, 3 House, 4 Lizard, and so forth up to 13 Reed, after which the cycle of numbers would restart (though the twenty day signs had not yet been exhausted) giving 1 Jaguar. 

#Mayan Sacred Round or 260-day calendar.
The tzolk'in calendar combines twenty day names with the thirteen numbers of the trecena cycle to produce 260 unique days. It is used to determine the time of religious and ceremonial events and for divination. Each successive day is numbered from 1 up to 13 and then starting again at 1. Separately from this, every day is given a name in sequence from a list of 20 day names:

#Solar calendar (Haab)
The Haab' was the Maya solar calendar made up of eighteen months of twenty days each plus a period of five days ("nameless days") at the end of the year known as Wayeb' (or Uayeb in 16th C. orthography). Bricker (1982) estimates that the Haab' was first used around 550 BC with a starting point of the winter solstice.[11]

# Calendar round
Neither the Tzolk'in nor the Haab' system numbered the years. The combination of a Tzolk'in date and a Haab' date was enough to identify a date to most people's satisfaction, as such a combination did not occur again for another 52 years, above general life expectancy.

Because the two calendars were based on 260 days and 365 days respectively, the whole cycle would repeat itself every 52 Haab' years exactly. This period was known as a Calendar Round. The end of the Calendar Round was a period of unrest and bad luck among the Maya, as they waited in expectation to see if the gods would grant them another cycle of 52 years.

#Maya long count
The Maya name for a day was k'in. Twenty of these k'ins are known as a winal or uinal. Eighteen winals make one tun. Twenty tuns are known as a k'atun. Twenty k'atuns make a b'ak'tun.

Days 	Long Count period 	Long Count period 	Approx solar years
1 	= 1 K'in 	  	 
20 	= 20 K'in 	= 1 Winal 	0.055
360 	= 18 Winal 	= 1 Tun 	1
7,200 	= 20 Tun 	= 1 K'atun 	19.7
144,000 	= 20 K'atun 	= 1 B'ak'tun 	394.3

--phooka 11:33, 12 May 2010 (UTC)