heliacal rising

British  

/ hɪˈlaɪəkəl /

noun

1. the rising of a celestial object at approximately the same time as the rising of the sun

2. the date at which such a celestial object first becomes visible in the dawn sky

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Etymology

Origin of heliacal rising

C17: from Late Latin hēliacus relating to the sun, from Greek hēliakos, from hēlios the sun

Example Sentences

See Examples For:

heliacal rising

On the ceiling of the Memnonium at Thebes the heliacal rising of Sirius is represented under the form and name of Isis.

From Astronomical Curiosities Facts and Fallacies by Gore, J. Ellard

They approximated to the truth in reference to the solar year, by observing the equinoxes and solstices, and the heliacal rising of particular stars.

From The Old Roman World, : the Grandeur and Failure of Its Civilization. by Lord, John

Swart star: the Dogstar, called swarthy because its heliacal rising in ancient times occurred soon after mid-summer. moist vows: either tearful prayers, or prayers for one at sea.

From The Golden Treasury Of the Best Songs and Lyrical Poems in the English Language by Palgrave, Francis Turner

The Muhammadan month begins with the heliacal rising of the moon, and this may have taken place on the 24th or 25th evening.

From A Forgotten Empire (Vijayanagar): a contribution to the history of India by Sewell, Robert

The Egyptians had, at an early period, observed that the rising of the Nile coincided with the heliacal rising of Sirius, the Dog-star, and hence they very plausibly referred it to celestial agencies.

From History of the Intellectual Development of Europe, Volume I (of 2) Revised Edition by Draper, John William