Outlander is full of superstitions, but one thing is certain: Claire fell through the stones in the 1940s and landed in Scotland 200 years earlier, and many figured out Claire was a time traveler. This delicate information is kept secret, but while most characters believe Claire to simply be a healer with witch-like tendencies, a select few know the truth about the 20th-century sassenach. Jamie Fraser is the first to learn of Claire’s time travel. His unwavering trust and love for Claire are evident when he accepts her extraordinary tale without question.
https://screenrant.com/outlander-every-character-knows-claire-time-travel/