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

In Egypt, another reason was, that then the Nile began to overflow, at the heliacal rising of Sirius.

From Morals and Dogma of the Ancient and Accepted Scottish Rite of Freemasonry by Pike, Albert

The more precise fixing of new year's day was accomplished through observation of the time of the so-called heliacal rising of the dog-star, Sirius, which bore the Egyptian name Sothis.

From A History of Science — Volume 1 by Williams, Edward Huntington

Brugsch states that the appearance of the said new moon, which was also associated with the heliacal rising of Sirius, would range from Aug.

From The Fundamental Principles of Old and New World Civilizations by Nuttall, Zelia

If therefore Ilioneus, according to our supposition, understand the heliacal rising of Orion, Anna must mean the achronical, which the different epithets given to that constellation seem to manifest.

From Discourses on Satire and on Epic Poetry by Dryden, John

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