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English to English adjective
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pertaining to or near the sun; especially the first rising of a star after and last setting before its invisibility owing to its conjunction with the sun |  | Example: the heliacal rising of the Dog Star
the heliacal or Sothic year is determined by the heliacal rising of Sothis (the Egyptian name for the Dog Star)
source: wordnet30
| 2 |
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. | | source: webster1913
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