What are the Mayan, Solar, Terrestrial and Venusian calendars?

In their study of astronomy, the Mayans invented the calendar after a long period of observation of the sun and stars. There are four Mayan calendars***, namely: the Mayan calendar, the solar calendar, the lunar calendar and the Venus calendar. The Mayan calendar is divided into 13 months in a year, each month is 20 days, only 260 days in a year; the solar calendar is divided into 18 months per year, each month is also 20 days, at the end of the year, to be added to the outside 5 days, the whole year the full 365 days. Each year, are calculated from the winter solstice sunrise, each month has a name (all related to the season of agriculture), such as: Chus (sowing month), Moore (harvest month) and so on. The solar calendar belongs to the Maya life calendar (has reached a fairly high level); Taiyin calendar for 365 days and 8 hours a year (765 AD, 500 kilometers around the priests gathered in Copan, exchanging their respective data on the study of celestial phenomena); Venusian calendar is the Maya through the long-term observation of the planet Venus, measured in the Earth orbits around the Sun 8 times (8 years), and Venus is exactly 5 times around the circle (5 Venusian years), and then it just keeps going round and round. They used 2920 (8 years) divided by 5, it is derived from Venus a year (a circle around the Sun) for 584 days (modern scientists calculated as 583.92 days, with a difference of 72 minutes, that is, 6 minutes per month, less than 12 seconds per day).