Where did the word trepidation come from?

Trepidation Has Latin Roots

The word comes from the Latin verb trepidare, which means "to tremble." When it first appeared in English in the early 1600s, it meant "tremulous motion" or "tremor." Around the same time, English speakers also started using the "nervous agitation" sense of trepidation that we use today.

Who invented trepidation?

The origin of the theory of trepidation comes from the Small Commentary to the Handy Tables written by Theon of Alexandria in the 4th century CE. In precession, the equinoxes appear to move slowly through the ecliptic, completing a revolution in approximately 25,800 years (according to modern astronomers).