heliacal

a. கதிரவனைச் சார்ந்த, சூரியனுக்கு அணித்தான, கதிரவன் மண்டலத்தோடியைந்து காணப்பெறுகிற, கதிரவன் மண்டலத்திற்கு மிக அருகாகத் தோற்றுகிற.

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He*li"a*cal, a. Etym: [Gr. héliaque.] (Astron.) Defn: 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. Sir T. Browne. Note: The heliacal rising of a star is when, after being in conjunction with the sun, and invisible, it emerges from the light so as to be visible in the morning before sunrising. On the contrary, the heliacal setting of a star is when the sun approaches conjunction so near as to render the star invisible.

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