Simple question. What did SG-1 do with the puddle jumper they found on the planet?
It was used to travel back in time
From "Moebius: Part 1" (8.19):
[The Puddle Jumper with the time device is flying above Earth.]
[Daniel and O'Neill are sitting in the pilot chairs as Carter works on the time device. Teal'c is standing behind Daniel.]
DANIEL Now remember, Jack, 3000 B.C. After Sam hooks up the power to the time device, think about that date and nothing else.
O'NEILL This thing's Ancient. How's it gonna know from B.C.?
CARTER Your mind is controlling it. The Ancient computer should be able to extrapolate from your concept of time.
O'NEILL Well, shouldn't we test it on a slightly smaller leap? Like say, to 1908?
CARTER Actually sir, we were able to determine from the data log that the technology only works in time jumps longer than a couple hundred years.