He'liacally. adv. [from heliacal.]
From the rising of this star, not cosmically, that is, with the sun, but heliacally, that is, its emersion from the rays of the sun, the ancients computed in their canicular days. Brown.
He is tempestuous in the Summer, when he rises heliacally; and rainy in the Winter, when he rises achronically. Dryden.