What calendars were made in the late Vedic era of ancient India?

In the late Vedic era of ancient India, calendars were worked out. However, the calendars in different places are not uniform, and some take1February as a year, with 27 days in January and 324 days in a year; Some take 13 months as a year and 35 1 day a year; Others take 12 months as a year, in which 6 months and 30 days are called big months, 6 months and 29 days are abortion, and a year is ***354 days; There is also the saying of the year of the world. The year of the world is1February, with 30 days per month and ***360 days. Every five years is a cycle, called a yoga, and a leap month is set to adjust the precession. The names of different seasons in a year also appear, or spring, heat, rain, autumn, cold, winter, or winter, summer, rain, and four and five seasons. The division of monthly time can be roughly divided into two types: looking at the sun and the new moon. It is more common to look at the sun and look for January from sight. Shuori, from new moon to dark January, is popular in the south. There are also many ways to divide the time of day, or divide it into four time periods: morning, noon, afternoon and evening, or divide it more finely. 60 calories a day, one card is equivalent to 24 minutes.