• Source: Tahun tropis

Tahun tropis (juga tahun matahari) merupakan tahun yang didasarkan pada revolusi bumi terhadap titik musim semi, yaitu terhadap awal berbagai musim. Tahun ini lamanya rata-rata 365.2421 siang hari atau 365 hari 5 jam 48 menit 46 detik.




Referensi


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Morrison, L. V. & Stephenson, F. R. (2004). Historical values of the Earth's clock error ΔT and the calculation of eclipses. Journal for the History of Astronomy Vol. 35, Part 3, No. 120, p. 327–336
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Seidelmann, P. K. (Ed.). (1992). Explanatory supplement to the Astronomical almanac. Sausalito, CA: University Science Books. ISBN 0-935702-68-7
tropic. (1992). American Heritage Dictionary, 3rd ed. Boston: Houghton-Mifflin.

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