heliacal

• adj. 太阳的；与太阳同时升落的；接近太阳的

1. 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;

"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)"

来自希腊语Helios,太阳神，词源同Sol,sun.

heliacal (adj.)

"pertaining to the sun," c. 1600, with -al (1) and Greek heliakos "of the sun," from helios "sun" (see sol). The heliacal year is reckoned from the heliacal rising of Sirius; thus it also is known as the canicular year.