形容詞 heliacal:

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
   同義詞：heliac

he.li.a.cal

adj.（形容詞）
Of or relating to the sun, especially rising and setting with the sun.
太陽的，與太陽同時出沒的：太陽的，或與太陽有關的，尤指與太陽同升同落的

來源：
From Late Latin hôliacus
源自 后期拉丁語 hôliacus
from Greek hôliakos
源自 希臘語 hôliakos
from hôlios [sun] * see s3wel-
源自 hôlios [太陽] *參見 s3wel-

【引伸】
heli.acally
adv.（副詞）