tithin.

Brit.

/ˈtɪθi/, U.S.

/ˈtɪθi/

Forms: 1700s– tithi, 1900s– thithi.

Origin: A borrowing from Sanskrit. Etymon: Sanskrit tithi.

Etymology: < Sanskrit tithi, apparently a back-formation < katitha ( < kati how many ( < the same Indo-European base as classical Latin quot ) + -tha , suffix forming ordinal numerals: see -th suffix²) and the similarly-formed demonstrative tatitha.The form thithi reflects an alternative transliteration convention.

Chiefly historical.

A period of time during which the angle between the sun and the moon increases by 12 degrees, used in Hindu astronomy and timekeeping, and also applied to the corresponding period of time in Babylonian astronomy.Tithis vary in duration at different times. As 30 tithis correspond to a lunar month, the average length of a tithi corresponds to a lunar day (24 hours 50 minutes approx.).

ΚΠ

1791 S. Davies in Asiatick Researches 2 233 The 1603000080 Chándra, or lunar, days, called also Tit'his, are each one thirteenth part of the moon's synodical month.

1847 Jrnl. Royal Asiatic Soc. 9 92 It [sc. the festival of Sivarátri] should begin on whichever of the two tithis or lunar days comprises the larger proportion of the hours of the night.

1930 Isis 14 395 The Hindu astronomers had two systems of reckoning: the lunar mansions or the Tithis and the signs of the zodiac or the râs'is.

1998 D. Bellos et al. tr. G. Ifrah Universal Hist. Numbers xxiv. 407/2 The tithi [is] a unit of time used in the Babylonian tablets and corresponding to the thirtieth of a synodic revolution of the Moon.

2003 Dædalus Fall 48/1 The Indian calendar is itself intricate; for instance, the day begins at local sunrise and is numbered after the tithi that is then current, with the tithis being bounded by the moments..at which the elongation between the two luminaries had increased by twelve degrees.

This entry has been updated (OED Third Edition, January 2018; most recently modified version published online March 2022).

单词	tithi
释义	tithin. Brit. /ˈtɪθi/, U.S. /ˈtɪθi/ Forms: 1700s– tithi, 1900s– thithi. Origin: A borrowing from Sanskrit. Etymon: Sanskrit tithi. Etymology: < Sanskrit tithi, apparently a back-formation < katitha ( < kati how many ( < the same Indo-European base as classical Latin quot ) + -tha , suffix forming ordinal numerals: see -th suffix²) and the similarly-formed demonstrative tatitha.The form thithi reflects an alternative transliteration convention. Chiefly historical. A period of time during which the angle between the sun and the moon increases by 12 degrees, used in Hindu astronomy and timekeeping, and also applied to the corresponding period of time in Babylonian astronomy.Tithis vary in duration at different times. As 30 tithis correspond to a lunar month, the average length of a tithi corresponds to a lunar day (24 hours 50 minutes approx.). ΚΠ 1791 S. Davies in Asiatick Researches 2 233 The 1603000080 Chándra, or lunar, days, called also Tit'his, are each one thirteenth part of the moon's synodical month. 1847 Jrnl. Royal Asiatic Soc. 9 92 It [sc. the festival of Sivarátri] should begin on whichever of the two tithis or lunar days comprises the larger proportion of the hours of the night. 1930 Isis 14 395 The Hindu astronomers had two systems of reckoning: the lunar mansions or the Tithis and the signs of the zodiac or the râs'is. 1998 D. Bellos et al. tr. G. Ifrah Universal Hist. Numbers xxiv. 407/2 The tithi [is] a unit of time used in the Babylonian tablets and corresponding to the thirtieth of a synodic revolution of the Moon. 2003 Dædalus Fall 48/1 The Indian calendar is itself intricate; for instance, the day begins at local sunrise and is numbered after the tithi that is then current, with the tithis being bounded by the moments..at which the elongation between the two luminaries had increased by twelve degrees. This entry has been updated (OED Third Edition, January 2018; most recently modified version published online March 2022). < n.1791
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