he·li·a·cal·ly英hɪ'laɪəkəl美hɪ'laɪəkəlBNC²³⁶²¹³⁺¹ 基本英英近义反义 adj.太阳的⁷⁵;和太阳同时或几乎同时出没的²⁵副词heliacally Adjective: 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