Tibetan New Year and Lunar New Year are sometimes inconsistent and sometimes consistent. There are four situations: 1, completely consistent, 2, Tibetan calendar is one day later, 3, Tibetan calendar is one month later, 4, Tibetan calendar is one month later. Why is this? The New Year of the Tibetan Water Dog Year is equivalent to February 24th 1982 on the Gregorian calendar, which is 4 months earlier than the year of the China lunar calendar. Moreover, there is no leap month in the Tibetan calendar, so it has caught up again, so it will not be a month late next year. The Tibetan Year of the Pig is leap 10 month, but not in the Han calendar. The Tibetan New Year in the Year of the Rat is one month later than the Lunar New Year. The leap month in Tibetan calendar is in turn in time, and the leap month in lunar calendar is constitutional calendar in time. The main reason why the setting method of time wheel calendar is different from that of constitutional calendar has been mentioned above. In this case, the difference between the two is either one month or not. Why is there a time difference? There are three reasons for this. First, the current Tibetan calendar stipulates that the "king" must be 15 days a month. We know that a new moon is 29 and a half days, and the average time from the new moon to the moon is about 14 and 3/4 days, not a whole 15 days, so the "new moon" in Tibetan calendar is not necessarily on the first day. The Han calendar stipulates that the new moon must be the first day of a month, so it is not necessarily 15. There is a saying in the Han nationality that "fifteen is not round, but sixteen is round". When the moon is the roundest, it can be observed directly with the naked eye, but the "new moon" is not easy to observe directly with the naked eye and needs to be calculated. Therefore, "fixed hope" is relatively easy to master and is a commonly used method in ancient times. Second, the starting point of the calendar day, dawn can distinguish the moment of "palm print", while the lunar calendar takes midnight "Zi Shi", that is, the zero point of modern watches as the starting point. During the period from Zizheng to Shi Tian, the calendar counts the day before and the day after. For example, when we said "two o'clock last night", it was actually after midnight, today, not yesterday. "Dawn" is more intuitive than "Zi Zheng" in the middle of the night. Third, the size of the month is arranged in different ways. As I said before, "Wang Shuo" is 29 and a half days, and days and days are the basic time units used in calendars. In life, we can't divide a day into two halves and make it belong to different months. The first half belongs to last month and the second half belongs to next month. In order to make the number of days in each month an integer, there are two kinds of calendar months in the lunar calendar, the big month is 30 days and the small month is 29 days, so that the big month and the small month make up for each other and make the average length of calendar months close to that of Wang Shuoyue. The specific algorithm stipulated in the calendar of People's Republic of China (PRC) Constitution is based on the comparison between "the first month" and "February", in which the sun is bigger than the previous one, but smaller than the previous one. This is because the sun is 10, and the sun is different between two "new days", that is to say, the number of days in the middle is not an integer multiple of ten, not 30, that is, 299 days, but an abortion. Because every lunar month (that is, the first month) in the lunar calendar is fixed as 30 lunar days, neither more nor less. It is a very special calculation method in the calendar to distinguish between "heavy day" and "short day" by their existence. As discussed above as a special section, different methods to determine the size of the month may lead to different results, resulting in a difference of one day, but it will only be one day at most, because there is still a full moon as a common standard. The above is in terms of the modern situation. Looking back at history, the situation is as follows: "/kloc-The leap months of these two calendars were the same around the 6th century; Before this, the leap month in Tibetan calendar was later than that in Han calendar; After that, it was earlier than the Han calendar, which is the most important relationship between the two calendars and is worth remembering.