angulus rectus

Latin · noun
variant rectus angulus
Edited by: Kierán Meinhardt
Last edited: 2026-10-14
Meanings
Literal translation
straight angle
Categories
mathematical quantity
mathematical entity
Related Lemmata 1 ›

1. right angle

1.a right angle mathematical quantity, mathematical entity

Adiciendus est adhuc meridianus circulus, qui ὁρίζοντα rectis angulis secat.

‘We still have to add the meridian circle, which cuts the horizon at right angles.’

— Seneca, Natural Questions 5.17.3

Genre: philosophy Date: 62/63 CE

Seneca. Natural Questions, Volume II: Books 4-7. Translated by Thomas H. Corcoran. Loeb Classical Library 457. Cambridge, MA: Harvard University Press, 1972. 110-111

Cite this entry
APA (7th)
Meinhardt, K. (2026). angulus rectus (Lemma #1850). The ZODIAC Glossary: A Cross-Cultural Glossary of Ancient Astral Science. https://zodiacglossary.github.io/lemma/1850/
Chicago (Author-Date)
Meinhardt, K. (2026). angulus rectus (Lemma #1850). The ZODIAC Glossary: A Cross-Cultural Glossary of Ancient Astral Science. https://zodiacglossary.github.io/lemma/1850/
MLA (9th)
Meinhardt, K. (2026). angulus rectus (Lemma #1850). The ZODIAC Glossary: A Cross-Cultural Glossary of Ancient Astral Science. https://zodiacglossary.github.io/lemma/1850/
Harvard
Meinhardt, K. (2026) angulus rectus (Lemma #1850), The ZODIAC Glossary: A Cross-Cultural Glossary of Ancient Astral Science. Available at: https://zodiacglossary.github.io/lemma/1850/ (Accessed: November 5, 2026).
BibTeX 
@misc{zodiac1850,
	note = {[Online; accessed 2026-11-05]},
	author = {Meinhardt, Kierán},
	year = {2026},
	title = {angulus rectus ({Lemma} #1850)},
	url = {https://zodiacglossary.github.io/lemma/1850/},
	howpublished = {https://zodiacglossary.github.io/lemma/1850/},
}