ascension (n.)

c. 1300, "ascent of Christ from earth into Heaven in the presence of his disciples on the 40th day after the Resurrection," from Latin ascensionem (nominative ascensio) "a rising," noun of action from past-participle stem of ascendere "to mount, ascend, go up" (see ascend). The astronomical sense is recorded late 14c.; the meaning "action of ascending" is from 1590s. Related: Ascensional.

ascend (v.)

late 14c., "move upward," from Latin ascendere "to climb up, mount," of planets, constellations, "come over the horizon," figuratively "to rise, reach," from ad "to" (see ad-) scandere "to climb" (see scan (v.)). Also in 15c. used with a sense "to mount (a female) for copulation." The meaning "slope upward" is from 1832. Related: Ascended; ascending. An Old English word for it was stigan.

Spitballing here for direction… I got it in my head for whatever reason that ascension has something to do with undiscovered stars learned…