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

Either the calendar did not originate in Egypt, or it was introduced in 2780 B.C., when again the heliacal rising Sothis fell on the first of Thoth.

From The Egyptian Conception of Immortality by George Andrew Reisner

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 Zelia Nuttall

This period, measured thus by the heliacal rising of Sothis, is spoken of as the Sothic cycle.

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

According to an extremely ancient belief it was the goddess Hathor Isis-Sothis who caused the inundation of the Nile which, according to the inscriptions, coincided with the heliacal rising of Sirius.

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

The heliacal rising of a constellation is when it comes from under the rays of the sun, and begins to appear before daylight.

From Discourses on Satire and on Epic Poetry by John Dryden