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

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Example Sentences

See Examples For:

heliacal rising

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

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 Robert Sewell

The first day of the Muhammadan month Jamada' l akhir, corresponding to the heliacal rising of the moon on that occasion, was Saturday, May 19.

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

The dies caniculares, or dog-days, were reckoned to begin twenty days before, and to continue for twenty days after, the heliacal rising of Sirius, the dog-star.

From The Astronomy of Milton's 'Paradise Lost' by Thomas Nathaniel Orchard

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

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