| 释义 |
heliacal, a.|hɪˈlaɪəkəl|
[f. as prec. + -al1.]
1. Astron. 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.
1607A. Brewer Lingua iii. vi, Setting of stars, chronic, and heliacal. 1631Widdowes Nat. Philos. (ed. 2) 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. 1728Newton Chronol. Amended 15 By observing the Heliacal Risings and Setting of the stars, they found the length of the Solar year. 1834Nat. Philos., Astron. vii. 169/2 (U.K.S.) The Egyptian rural year was determined by the heliacal rising of Sirius.
†b. heliacal year, the year reckoned from the heliacal rising of Sirius, the canicular year; great heliacal year, the canicular cycle: see canicular 3.
1662Stillingfl. Orig. Sacr. 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.
1801W. Taylor in Monthly Mag. XII. 224 That the headaches and other symptoms of heliacal injury might not ensue. 1871Blackie Four Phases i. 21 Then the whole of your lofty heliacal philosophy is only a blaze of lies. |