φθινοπωρινὴ ἰσημερία
phthinopōrinē isēmeria

Greek noun

Last edited: 2025-02-03
Primary meaning autumnal equinox
Literal translation autumnal equinox
Variants
φθινοπωρινὴ ἰσημερία phthinopōrinē isēmeria
ἰσημερία φθινοπωρινὴ isēmeria phthinopōrinē
Edited by
autumnal equinox astronomical event

Ἰσημερία δέ ἐστι φθινοπωρινή, ὅταν ὁ ἥλιος ἀπ’ ἄρκτων πρὸς μεσημβρίαν παροδεύων πάλιν ἐπὶ τοῦ ἰσημερινοῦ γένηται κύκλου καὶ ἴσην τὴν ἡμέραν τῇ νυκτερινῇ ποιήσηται.

‘And it is autumnal equinox, when the sun, in passing from north to south, arrives at the celestial equator again and makes the day equal to the night.’

— Geminus 1.11

Genre: astronomy
Date: 1st century BCE

Geminus. 1975. Géminos, Introduction aux Phénomènes, ed. G. Aujac. Paris: Les Belles Lettres. 4

Cite this entry
APA (7th)
Peeters, T. (2025). φθινοπωρινὴ ἰσημερία (Lemma #1273). The ZODIAC Glossary: A Cross-Cultural Glossary of Ancient Astral Science. https://zodiacglossary.github.io/lemma/1273/
Chicago (Author-Date)
Peeters, T. (2025). φθινοπωρινὴ ἰσημερία (Lemma #1273). The ZODIAC Glossary: A Cross-Cultural Glossary of Ancient Astral Science. https://zodiacglossary.github.io/lemma/1273/
MLA (9th)
Peeters, T. (2025). φθινοπωρινὴ ἰσημερία (Lemma #1273). The ZODIAC Glossary: A Cross-Cultural Glossary of Ancient Astral Science. https://zodiacglossary.github.io/lemma/1273/
Harvard
Peeters, T. (2025) φθινοπωρινὴ ἰσημερία (Lemma #1273), The ZODIAC Glossary: A Cross-Cultural Glossary of Ancient Astral Science. Available at: https://zodiacglossary.github.io/lemma/1273/ (Accessed: December 1, 2025).
BibTeX 
@misc{zodiac1273,
	note = {[Online; accessed 2025-12-01]},
	author = {Peeters, Thomas},
	year = {2025},
	title = {φθινοπωρινὴ ἰσημερία ({Lemma} #1273)},
	url = {https://zodiacglossary.github.io/lemma/1273/},
	howpublished = {https://zodiacglossary.github.io/lemma/1273/},
}