heliacal$512490$ - definizione. Che cos'è heliacal$512490$
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Cosa (chi) è heliacal$512490$ - definizione

RISING OF STARS PRIOR TO SUNRISE
Heliacal setting; Heliacal risings; Heliacal; Helical rising; Heliacal rising and setting; Heliacal rise; Acronychal rising

Heliacal         
·adj Emerging from the light of the sun, or passing into it; rising or setting at the same, or nearly the same, time as the sun.
Heliacal rising         
The heliacal rising ( ) or star rise of a star occurs annually, or the similar phenomenon of a planet, when it first becomes visible above the eastern horizon at dawn just before sunrise (thus becoming "the morning star") after a complete orbit of the earth around the sun. Historically, the most important such rising is that of Sirius, which was an important feature of the Egyptian calendar and astronomical development.
heliacal         
[h?'l???k(?)l]
¦ adjective Astronomy denoting the first rising (or last setting) of a star or planet which occurs at the same time as the rising of the sun.
Origin
C17: via late L. from Gk heliakos (from helios 'sun') + -al.

Wikipedia

Heliacal rising

The heliacal rising ( hih-LY-ə-kəl) or star rise of a star occurs annually, or the similar phenomenon of a planet, when it first becomes visible above the eastern horizon at dawn just before sunrise (thus becoming "the morning star") after a complete orbit of the earth around the sun. Historically, the most important such rising is that of Sirius, which was an important feature of the Egyptian calendar and astronomical development. The rising of the Pleiades heralded the start of the Ancient Greek sailing season, using celestial navigation., as well as the farming season (attested by Hesiod in his Works and Days).