Elementary Temporal Mechanics

Elementary Temporal Mechanics was a course taught at Starfleet Academy to give cadets a basic overview, of temporal mechanics and time travel.

Julian Bashir took the Elementary Temporal Mechanics course. After travelling back in time to James T. Kirk's USS Enterprise (NCC-1701), Bashir was worried that Dierdre Watley was one of his own ancestors and that he was involved in a predestination paradox and might have to become his own great-grandfather. Bashir had learned about predestination paradoxes in Elementary Temporal Mechanics. 

''In the alternate reality, took the Elementary Temporal Mechanics course. also took the course at the same time as Kirk''.