Examples from the Web for solstitial
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.
Great circles passing through the equinoctial and solstitial points, and the poles of the earth.
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
Word Origin and History for solstitial
1550s, from Latin solstitialis, from solstitium (see solstice).