Length of Tropical Years 1900–2100

A tropical year is approximately 365.242189 days long. However, the exact length can vary up to 30 minutes.

Illustration image — The exact length of a Tropical Year (complete orbit) can vary up to 30 minutes.

A tropical year is also known as a solar year, an astronomical year, or an equinoctial year. It is defined as the time it takes to complete a full seasonal cycle. Because the Earth's speed is not constant, the length of tropical years can vary by up to 30 minutes.

The length of a tropical year is usually measured from one equinox or solstice to the next. The table below shows the exact time spans between the March equinoxes in the years 1900 to 2100.

Tropical Years 1900–2100

	Days	Hours	Minutes	Seconds
March 1900 – March 1901	365	5	44	40
March 1901 – March 1902	365	5	52	47
March 1902 – March 1903	365	5	58	26
March 1903 – March 1904	365	5	43	35
March 1904 – March 1905	365	5	59	8
March 1905 – March 1906	365	5	55	20
March 1906 – March 1907	365	5	40	10
March 1907 – March 1908	365	5	54	24
March 1908 – March 1909	365	5	45	31
March 1909 – March 1910	365	5	50	4
March 1910 – March 1911	365	5	51	22
March 1911 – March 1912	365	5	35	5
March 1912 – March 1913	365	5	48	41
March 1913 – March 1914	365	5	52	42
March 1914 – March 1915	365	5	40	44
March 1915 – March 1916	365	5	55	25
March 1916 – March 1917	365	5	50	33
March 1917 – March 1918	365	5	48	16
March 1918 – March 1919	365	5	53	32
March 1919 – March 1920	365	5	40	14
March 1920 – March 1921	365	5	51	34
March 1921 – March 1922	365	5	57	48
March 1922 – March 1923	365	5	40	1
March 1923 – March 1924	365	5	51	32
March 1924 – March 1925	365	5	52	0
March 1925 – March 1926	365	5	48	54
March 1926 – March 1927	365	5	58	2
March 1927 – March 1928	365	5	44	57
March 1928 – March 1929	365	5	50	49
March 1929 – March 1930	365	5	54	49
March 1930 – March 1931	365	5	36	39
March 1931 – March 1932	365	5	47	17
March 1932 – March 1933	365	5	49	23
March 1933 – March 1934	365	5	44	54
March 1934 – March 1935	365	5	49	40
March 1935 – March 1936	365	5	40	17
March 1936 – March 1937	365	5	47	7
March 1937 – March 1938	365	5	58	5
March 1938 – March 1939	365	5	45	26
March 1939 – March 1940	365	5	55	8
March 1940 – March 1941	365	5	56	52
March 1941 – March 1942	365	5	50	2
March 1942 – March 1943	365	5	52	9
March 1943 – March 1944	365	5	45	54
March 1944 – March 1945	365	5	48	35
March 1945 – March 1946	365	5	55	37
March 1946 – March 1947	365	5	39	53
March 1947 – March 1948	365	5	44	20
March 1948 – March 1949	365	5	51	4
March 1949 – March 1950	365	5	47	10
March 1950 – March 1951	365	5	50	33
March 1951 – March 1952	365	5	47	56
March 1952 – March 1953	365	5	46	56
March 1953 – March 1954	365	5	52	47
March 1954 – March 1955	365	5	41	53
March 1955 – March 1956	365	5	45	4
March 1956 – March 1957	365	5	56	14
March 1957 – March 1958	365	5	49	19
March 1958 – March 1959	365	5	48	38
March 1959 – March 1960	365	5	48	20
March 1960 – March 1961	365	5	49	16
March 1961 – March 1962	365	5	57	37
March 1962 – March 1963	365	5	50	5
March 1963 – March 1964	365	5	50	11
March 1964 – March 1965	365	5	55	1
March 1965 – March 1966	365	5	47	58
March 1966 – March 1967	365	5	44	6
March 1967 – March 1968	365	5	45	0
March 1968 – March 1969	365	5	46	13
March 1969 – March 1970	365	5	48	14
March 1970 – March 1971	365	5	41	50
March 1971 – March 1972	365	5	43	27
March 1972 – March 1973	365	5	50	53
March 1973 – March 1974	365	5	54	18
March 1974 – March 1975	365	5	49	55
March 1975 – March 1976	365	5	53	0
March 1976 – March 1977	365	5	52	43
March 1977 – March 1978	365	5	51	15
March 1978 – March 1979	365	5	48	35
March 1979 – March 1980	365	5	47	34
March 1980 – March 1981	365	5	53	20
March 1981 – March 1982	365	5	52	51
March 1982 – March 1983	365	5	42	58
March 1983 – March 1984	365	5	45	40
March 1984 – March 1985	365	5	49	16
March 1985 – March 1986	365	5	49	10
March 1986 – March 1987	365	5	49	5
March 1987 – March 1988	365	5	46	50
March 1988 – March 1989	365	5	49	37
March 1989 – March 1990	365	5	50	56
March 1990 – March 1991	365	5	42	48
March 1991 – March 1992	365	5	45	54
March 1992 – March 1993	365	5	52	47
March 1993 – March 1994	365	5	47	16
March 1994 – March 1995	365	5	46	34
March 1995 – March 1996	365	5	48	41
March 1996 – March 1997	365	5	51	30
March 1997 – March 1998	365	5	59	59
March 1998 – March 1999	365	5	51	6
March 1999 – March 2000	365	5	49	36
March 2000 – March 2001	365	5	55	22
March 2001 – March 2002	365	5	45	30
March 2002 – March 2003	365	5	43	41
March 2003 – March 2004	365	5	48	44
March 2004 – March 2005	365	5	44	59
March 2005 – March 2006	365	5	51	55
March 2006 – March 2007	365	5	42	3
March 2007 – March 2008	365	5	40	45
March 2008 – March 2009	365	5	55	19
March 2009 – March 2010	365	5	48	41
March 2010 – March 2011	365	5	48	23
March 2011 – March 2012	365	5	53	56
March 2012 – March 2013	365	5	47	22
March 2013 – March 2014	365	5	55	14
March 2014 – March 2015	365	5	48	2
March 2015 – March 2016	365	5	44	56
March 2016 – March 2017	365	5	58	36
March 2017 – March 2018	365	5	46	41
March 2018 – March 2019	365	5	43	12
March 2019 – March 2020	365	5	51	4
March 2020 – March 2021	365	5	47	55
March 2021 – March 2022	365	5	55	54
March 2022 – March 2023	365	5	50	55
March 2023 – March 2024	365	5	42	8
March 2024 – March 2025	365	5	54	53
March 2025 – March 2026	365	5	44	39
March 2026 – March 2027	365	5	38	39
March 2027 – March 2028	365	5	52	27
March 2028 – March 2029	365	5	44	57
March 2029 – March 2030	365	5	49	56
March 2030 – March 2031	365	5	49	6
March 2031 – March 2032	365	5	40	42
March 2032 – March 2033	365	6	0	57
March 2033 – March 2034	365	5	54	43
March 2034 – March 2035	365	5	45	14
March 2035 – March 2036	365	6	0	16
March 2036 – March 2037	365	5	47	17
March 2037 – March 2038	365	5	50	31
March 2038 – March 2039	365	5	51	14
March 2039 – March 2040	365	5	39	42
March 2040 – March 2041	365	5	55	7
March 2041 – March 2042	365	5	46	27
March 2042 – March 2043	365	5	34	43
March 2043 – March 2044	365	5	52	35
March 2044 – March 2045	365	5	47	15
March 2045 – March 2046	365	5	50	5
March 2046 – March 2047	365	5	54	53
March 2047 – March 2048	365	5	41	14
March 2048 – March 2049	365	5	54	39
March 2049 – March 2050	365	5	51	11
March 2050 – March 2051	365	5	39	25
March 2051 – March 2052	365	5	57	6
March 2052 – March 2053	365	5	51	17
March 2053 – March 2054	365	5	47	5
March 2054 – March 2055	365	5	54	20
March 2055 – March 2056	365	5	42	16
March 2056 – March 2057	365	5	57	1
March 2057 – March 2058	365	5	56	59
March 2058 – March 2059	365	5	39	25
March 2059 – March 2060	365	5	54	18
March 2060 – March 2061	365	5	47	44
March 2061 – March 2062	365	5	41	22
March 2062 – March 2063	365	5	51	31
March 2063 – March 2064	365	5	39	37
March 2064 – March 2065	365	5	49	27
March 2065 – March 2066	365	5	51	45
March 2066 – March 2067	365	5	33	54
March 2067 – March 2068	365	5	55	16
March 2068 – March 2069	365	5	56	17
March 2069 – March 2070	365	5	49	38
March 2070 – March 2071	365	6	0	1
March 2071 – March 2072	365	5	46	18
March 2072 – March 2073	365	5	52	18
March 2073 – March 2074	365	5	55	39
March 2074 – March 2075	365	5	37	36
March 2075 – March 2076	365	5	52	29
March 2076 – March 2077	365	5	52	11
March 2077 – March 2078	365	5	39	54
March 2078 – March 2079	365	5	49	51
March 2079 – March 2080	365	5	43	22
March 2080 – March 2081	365	5	50	17
March 2081 – March 2082	365	5	56	12
March 2082 – March 2083	365	5	40	10
March 2083 – March 2084	365	5	48	53
March 2084 – March 2085	365	5	54	13
March 2085 – March 2086	365	5	41	45
March 2086 – March 2087	365	5	53	0
March 2087 – March 2088	365	5	48	54
March 2088 – March 2089	365	5	49	24
March 2089 – March 2090	365	5	55	36
March 2090 – March 2091	365	5	39	56
March 2091 – March 2092	365	5	51	44
March 2092 – March 2093	365	6	1	6
March 2093 – March 2094	365	5	46	54
March 2094 – March 2095	365	5	53	38
March 2095 – March 2096	365	5	47	48
March 2096 – March 2097	365	5	45	35
March 2097 – March 2098	365	5	51	59
March 2098 – March 2099	365	5	37	16
March 2099 – March 2100	365	5	46	8

Topics: Astronomy, Timekeeping