† proemptosisn.

Origin: A borrowing from Greek, combined with an English element; modelled on a Greek lexical item. Etymons: pro- prefix², Greek ἔμπτωσις.

Etymology: < pro- prefix² + Hellenistic Greek ἔμπτωσις action of falling in or on (see metemptosis n.), after Hellenistic Greek προεμπίπτειν to fall on before. Compare metemptosis n. N.E.D. (1908) gives the pronunciation as (proˌem^ptō^u·sis) /prəʊɛmpˈtəʊs is/.

Astronomy. Obsolete.

The correction to the Gregorian calendar whereby, over the course of a 2,500-year period, one day is omitted every 300 years (seven times), and a further day omitted after another 400 years. Cf. metemptosis n.This correction (also called the lunar equation or lunar correction) prevented the new moon occurring earlier than the date predicted by the Metonic cycle, and was used in conjunction with the solar equation.

ΚΠ

1728 E. Chambers Cycl. Proemptosis, in Astronomy, that which makes the New Moons appear a Day later, by means of the Lunar Equation, than they would do without that Equation.

1754 New & Compl. Dict. Arts & Sci. III. 2060/1 When there is a metemptosis without a proemptosis, the next following, or lower index, must be taken.

1853 W. T. Brande Dict. Sci., Lit. & Art (ed. 3) 993/1 Proemptosis, the term applied to the lunar equation or addition of a day to prevent the new moon happening too soon.

This entry has been updated (OED Third Edition, June 2007; most recently modified version published online June 2020).

单词	proemptosis
释义	† proemptosisn. Origin: A borrowing from Greek, combined with an English element; modelled on a Greek lexical item. Etymons: pro- prefix², Greek ἔμπτωσις. Etymology: < pro- prefix² + Hellenistic Greek ἔμπτωσις action of falling in or on (see metemptosis n.), after Hellenistic Greek προεμπίπτειν to fall on before. Compare metemptosis n. N.E.D. (1908) gives the pronunciation as (proˌem^ptō^u·sis) /prəʊɛmpˈtəʊs is/. Astronomy. Obsolete. The correction to the Gregorian calendar whereby, over the course of a 2,500-year period, one day is omitted every 300 years (seven times), and a further day omitted after another 400 years. Cf. metemptosis n.This correction (also called the lunar equation or lunar correction) prevented the new moon occurring earlier than the date predicted by the Metonic cycle, and was used in conjunction with the solar equation. ΚΠ 1728 E. Chambers Cycl. Proemptosis, in Astronomy, that which makes the New Moons appear a Day later, by means of the Lunar Equation, than they would do without that Equation. 1754 New & Compl. Dict. Arts & Sci. III. 2060/1 When there is a metemptosis without a proemptosis, the next following, or lower index, must be taken. 1853 W. T. Brande Dict. Sci., Lit. & Art (ed. 3) 993/1 Proemptosis, the term applied to the lunar equation or addition of a day to prevent the new moon happening too soon. This entry has been updated (OED Third Edition, June 2007; most recently modified version published online June 2020). < n.1728
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