acronycal

• achronycal
• acronic
• acronychal
• acronical
• acronichal

From Ancient Greek ἄκρονυξ (ákronux, “nightfall”) +‎ -al, one of the three poetic times for the rising and setting of stars, along with cosmical and heliacal.

acronycal (not comparable)

1. (astronomy, of a star) Rising at sunset and setting at sunrise

• cosmical

• acronycally

• “Acronyc”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.