† metemptosisn.

Origin: A borrowing from Latin. Etymon: Latin metemptosis.

Etymology: < post-classical Latin metemptosis (1627 or earlier) < ancient Greek μετά after (see meta- prefix) + Hellenistic Greek ἔμπτωσις ( < ancient Greek ἐν in (see en- prefix¹) + πτῶσις falling (see ptosis n.), after ἐμπίπτειν to fall in or upon). N.E.D. (1906) gives the pronunciation as (metemptō^u·sis) /mɛtɛmpˈtəʊsɪs/.

Astronomy. Obsolete.

Omission of the extra day of a leap year; the correction to the Gregorian calendar whereby, in any 400-year period, three expected leap years (those which are divisible by 100 but not by 400) are omitted. Cf. proemptosis n.This correction (also called the solar equation) prevents the new moon occurring later than the date predicted by the Metonic lunar cycle.

ΘΚΠ

the world > the universe > cosmology > science of observation > astronomical calculation > [noun]

prosthaphaeresis1599

annual equation1700

lunar equation1712

metemptosis1728

1728 E. Chambers Cycl. (at cited word) By the Metemptosis, a Bissextile is suppressed each 134 Years, that is, three times in 400 Years.

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.

1797 Encycl. Brit. XI. 614/1 Metemptosis,..a term in chronology, expressing the solar equation, necessary to prevent the new moon from happening a day too late.

1853 W. T. Brande Dict. Sci., Lit. & Art 993 The opposite term is metemptosis, which is used to signify the solar equation necessary to prevent the new moon from falling a day too late.

This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2019).

单词	metemptosis
释义	† metemptosisn. Origin: A borrowing from Latin. Etymon: Latin metemptosis. Etymology: < post-classical Latin metemptosis (1627 or earlier) < ancient Greek μετά after (see meta- prefix) + Hellenistic Greek ἔμπτωσις ( < ancient Greek ἐν in (see en- prefix¹) + πτῶσις falling (see ptosis n.), after ἐμπίπτειν to fall in or upon). N.E.D. (1906) gives the pronunciation as (metemptō^u·sis) /mɛtɛmpˈtəʊsɪs/. Astronomy. Obsolete. Omission of the extra day of a leap year; the correction to the Gregorian calendar whereby, in any 400-year period, three expected leap years (those which are divisible by 100 but not by 400) are omitted. Cf. proemptosis n.This correction (also called the solar equation) prevents the new moon occurring later than the date predicted by the Metonic lunar cycle. ΘΚΠ the world > the universe > cosmology > science of observation > astronomical calculation > [noun] prosthaphaeresis1599 annual equation1700 lunar equation1712 metemptosis1728 1728 E. Chambers Cycl. (at cited word) By the Metemptosis, a Bissextile is suppressed each 134 Years, that is, three times in 400 Years. 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. 1797 Encycl. Brit. XI. 614/1 Metemptosis,..a term in chronology, expressing the solar equation, necessary to prevent the new moon from happening a day too late. 1853 W. T. Brande Dict. Sci., Lit. & Art 993 The opposite term is metemptosis, which is used to signify the solar equation necessary to prevent the new moon from falling a day too late. This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2019). < n.1728
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