solstitial

[ sol-stish-uh l, sohl- ]

/ sɒlˈstɪʃ əl, soʊl- /

of or relating to a solstice or the solstices: a solstitial point.

occurring at or about the time of a solstice.

characteristic of the summer solstice.

Origin of solstitial

1550–60; < Latin sōlstitiālis; see solstice, -al¹

sol·sti·tial·ly, adverb

The points were directed eastward, the two outside showing the two solstitial points, and that in the centre the equinoctial.

Ancient America, in Notes on American Archaeology |John D. Baldwin
A great circle passing through the poles and solstitial points.

The Sailor's Word-Book |William Henry Smyth
Great circles passing through the equinoctial and solstitial points, and the poles of the earth.

The Sailor's Word-Book |William Henry Smyth
Note the star μ, which serves to point out the Winter Solstice, where the solstitial colure intersects the ecliptic.

A Field Book of the Stars |William Tyler Olcott

On the surface of the sphere the equator, the ecliptic, the equinoctial, and the solstitial colures are represented.

Terrestrial and Celestial Globes Vol I |Edward Luther Stevenson