20 17 In how many years did July 18th of the lunar calendar and September 8th of the solar calendar happen on the same day?

20 17 Lunar July 18th and Gregorian September 8th can be met once in 19. Because there are 30 days in the first month and 29 days in the second month in the lunar calendar, 12 months in a year is 354 days, which means that in 19, plus seven leap months, it is 2 10 days, which is equivalent to 209 days missing in 19, that is to say, the lunar calendar.