Measurements of the Solar Year — According to Various Opinions

Source	Days	Hours	Minutes	Seconds	Notes
Modern Surya Siddhanta a foundational Sanskrit treatise on Indian astronomy	365	6	12	36.56	3 min 27 sec more than the actual value
Aryabhatiya written by the 5th-century mathematician Aryabhata	365	6	12	29.64	3 min 20 sec more than the actual value
Brahmasphuta Siddhanta the 7th-century work by Brahmagupta	365	6	12	9	3 minutes more than the actual value
Mean Sidereal Year the time it takes for the Sun to return to the same position relative to the fixed stars according to Lockyer	365	6	9	6.3	Actual Sidereal Year
Anomalistic Year original: "Manda-kendra-varsha"; the time between the Earth's closest approaches to the Sun	365	6	13	48.3
Tropical Year original: "Sayana-varsha"; the year measured by the return to an equinox, which dictates the seasons	365	5	48	46.054	6 min 26 sec [more] than the actual Tropical Year
Tropical Year according to Ptolemy*	365	5	55	12	More than the actual Tropical Year
Tropical Year according to Copernicus X	365	5	55	58	7 min 6 sec [more]
Sidereal Year according to Meton a 5th-century BCE Greek astronomer §	365	6	18	57	6 min 48 sec more than the actual Sidereal Year
Sidereal Year, Babylonian §	365	6	13	36.3	4 min 30 sec more than the actual Sidereal Year

* original Latin: "Syntaxis" The Almagest, Karl Manitius's edition, Vol. I, p. 146.

X Heroes of Science, p. 63

§ Encyclopaedia Britannica, History of Astronomy.