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1662 T. Stanley Hist. Chaldaick Philos. i. 3 A canicular Cycle, which consists of 1461 years (and are 1460 natural years).

1679 J. Moxon Math. made Easie 95 Natural Year, one Revolution of the Sun by his proper motion, or 365 days and almost 6 hours.

1757 J. Ferguson Astron. Explained (ed. 2) xxi. §408 The Solar or Tropical Year, which contains 365 days, 5 hours, 48 minutes, 57 seconds; and is the only proper or natural year, because it always keeps the same seasons to the same months.

1855 U.S. Rev. Sept. 197 If no correction were made, a complete revolution would be produced in time, and the beginning of the natural year would successively coincide with a different day of the calendar.

1974 Philos. Trans. (Royal Soc.) A. 276 51 The earliest calendar year [in ancient Egypt] was lunar, kept in place in the natural year by the star Sirius.

2001 Morning Call (Allentown, Pa.) (Nexis) 20 June b3 It [sc. a sundial] is a way for students to visualize..the sun-earth cycle and the variations that occur there through the natural year.