heliacaladj.
/hɪˈlʌɪəkəl/ 1. † b. heliacal year, the year reckoned from the heliacal rising of Sirius, the canicular year; great heliacal year, the canicular cycle: see canicular adj. 3.
a. Astronomy. Said of the rising of a star when it first emerges from the sun's rays and becomes visible before sunrise, or of its setting when it is last visible after sunset before being lost in the sun's rays.
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the world > the universe > star > stellar motion > [adjective] > rising or setting
sunly1556
cosmical1594
heliacal1607
heliac1775
1607 T. Tomkis Lingua iii. vi Setting of stars, chronic, and heliacal.
1631 D. Widdowes tr. W. A. Scribonius Nat. Philos. (new ed.) 6 Apparent rising is called Heli [a] cal which is of stars getting out of the sun beames; and so if the star get into the sun beames at setting.
a1727 I. Newton Short. Chron. 1st Memory in Chronol. Anc. Kingdoms Amended (1728) 15 By observing the Heliacal Risings and Setting of the stars, they found the length of the Solar year.
1834 Nat. Philos. (Libr. Useful Knowl.) III. Astron. vii. 169/2 The Egyptian rural year was determined by the heliacal rising of Sirius.
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1662 E. Stillingfleet Origines Sacræ i. vi. §1 In 1461 years, which was the great Heliacall year, it returns to the same beginning.
2. Relating to or produced by the sun, solar. rare.
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the world > the universe > sun > [adjective] > produced by
sunny1566
solar1698
heliacal1801
1801 W. Taylor in Monthly Mag. 12 224 That the headaches and other symptoms of heliacal injury might not ensue.
1871 J. S. Blackie Four Phases Morals i. 21 Then the whole of your lofty heliacal philosophy is only a blaze of lies.
This entry has not yet been fully updated (first published 1898; most recently modified version published online September 2018).
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adj.1607