Full moon days

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Full moon days

Lunar calendar has 354 days in a year and solar calendar has 365.24 days in a year. Normally we have 12 full moons in a Gregorian calendar year. However approximately once in 3 years we will have 13 full moons in a calendar year. To be precise we will have 13 full moons in 7 years for every group of 19 years. This is because 19 years = 19 x 365.25 days = 6940 days = 6940 /29.53 = 235 full moons. We have 19 x 12 = 228 solar calendar months. Hence we get 7 extra full moons in every 19 solar calendar years in addition to 19 x 12.

During 1900 – 2100, we can see 13 full moons in the years:-

1901 July, 1904 March, 1906 November, 1909 August, 1912 May, 1915 March, 1917 September.
1920 July, 1923 April, 1925 October, 1928 August, 1931 May, 1933 December, 1936 September.
1939 July, 1942 April, 1944 October, 1947 August, 1950 May, 1952 December, 1955 October.
1958 July, 1961 April, 1963 November, 1966 August, 1969 May, 1971 December, 1974 October.
1977 July, 1980 March, 1982 December, 1985 July, 1988 May, 1990 December, 1993 September.
1996 July, 1999 March, 2001 November, 2004 July, 2007 June, 2009 December, 2012 August.
2015 July, 2018 March, 2020 October, 2023 August, 2026 May, 2028 December, 2031 September.
2034 July, 2037 March, 2039 October, 2042 August, 2045 May, 2048 January, 2050 September.
2053 July, 2056 March, 2058 October, 2061 August, 2064 May, 2066 December, 2069 September.
2072 May, 2075 April, 2077 October, 2080 July, 2083 May, 2085 December, 2088 September.
2091 July, 2094 April, 2096 October, 2099 August.

Now using the above data, one can work out how many full moons he has seen till now.

For example those born before 17/11/1937 have seen 2 full moons in 1937, 13 full moons each in 1939, 1942, 1944, 1947, 1950, 1952, 1955, 1958, 1961, 1963, 1966, 1969, 1971, 1974, 1977, 1980, 1982, 1985, 1988, 1990, 1993, 1996, 1999, 2001, 2004, 2007, 2009, 2012, 2015, i.e. 29 years and 9 full moons in 2018 till 26th August. This is in addition to the 12 full moons seen normally during the period 1938 to 2017 i.e. 80 years. The total number of full moons seen are thus = 2 + 29 + 9 + (80 x 12) = 2 + 29 + 9 + 960 = 1000 as on 26/08/2018.

Another example , a person born say during 25-08-1953 and 23/09/1953 has seen 4 full moons in 1953, 13 full moons in 1955, 1958, 1961, 1963, 1966, 1969, 1971, 1974, 1977, 1980, 1982, 1985, 1988, 1990, 1993, 1996, 1999, 2001, 2004, 2007, 2009, 2012, 2015 i.e. 23 years and 9 full moons in 2018 till 26th August. This is in addition to the 12 full moons seen normally during the period 1954 to 2017 i.e. 64 years. The total number of full moons seen are thus = 4 + 23 + 9+ (64 x 12) = 4 + 23 + 9+ 768 = 804.

This way one can work out the number of full moons he has seen since his birth to till date.

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