Crossword Genius

Longest day or shortest day (8)

Ross

I believe the answer is:

solstice

(Other definitions for solstice that I've seen before include "21 June or 22 December?" , "it occurs biannually" , "When the sun is at its greatest distance from the celestial equator" , "When night and day are most unequal" , "High or low point for the sun" .)

I've seen this clue in the Sydney Morning Herald.
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