solstitial

Of or pertaining to a solstice: as, a solstitial point.

Happening at a solstice—especially, with reference to the northern hemisphere, at the summer solstice, or midsummer.

Of or pertaining to a solstice.

Happening at a solstice; esp. (with reference to the northern hemisphere), happening at the summer solstice, or midsummer.

Pertaining to a solstice.

Occurring on a solstice.