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Use "precessional" in a sentence
"Thus astronomers must have made great progress in their science before they could select as a day for counting from, the epoch when the slow reeling motion of the earth (the so-called precessional motion) brought the Pleiades centrally south, at noon, at the time of the vernal equinox."
"When these blades rotate they create large gyroscopic forces sometimes called precessional forces."
"In his Galactic Alignment theory, John Major Jenkins describes the coming 2012 event as the "precessional convergence of Milky Way and solstice sun.""