I. Lit., of or belonging to the summer solstice, solstitial (opp. brumalis): “(sol) Brumales adeat flexus, atque inde revortens Cancri se ut vortat metas ad solstitiales,” Lucr. 5, 617: “dies,” the day on which the sun enters Cancer, the longest day, Cic. Tusc. 1, 39, 94: “tempus,” Ov. F. 6, 790; Vitr. 9, 5: “nox,” i. e. the shortest, Ov. P. 2, 4, 26: “ortus sideris,” Just. 13, 7, 10: “circulus,” the tropic of Cancer, Varr. L. L. 9, § 24 Müll.; Plin. 2, 11, 8, § 50.—Called also orbis, Cic. N. D. 3, 14, 37: “exortus,” the point where the sun rises at the summer solstice, Plin. 18, 34, 77, § 333.—
II. Transf.
A. Of or belonging to midsummer or summer heat: herba, i. e. a summer plant or one that quickly withers, Plaut. Ps. 1, 1, 36; Aus. Prof. 6, 35; Plin. 26, 5, 14, § 26: “spinae,” Col. 2, 17, 1: “acini,” Plin. 14, 16, 18, § 99: “tempus,” Liv. 35, 49 Drak.: “caput Leonis,” Luc. 6, 338: “morbus,” the midsummer fever, Plaut. Trin. 2, 4, 143.—
B. Of or belonging to the sun, solar (for solaris): “annus, qui solstitiali circumagitur orbe,” in a solar revolution, Liv. 1, 19, 6; “for which, annus,” Serv. A. 4, 653: “plaga,” i. e. the south, Sol. 25.