P2X-555 was the intended destination of SG-1 when they were accidentally thrown back in time approximately 30 years. At certain times during the year, the direct line between P2X-555 and Earth takes the wormhole within 70,000 miles of the sun, making it necessary to update the computer's drift calculation to include gravitational space/time warping. Due to a solar flare at the exact moment of travel, SG-1 did not reach their destination and was instead sent back to Earth on August 4, 1969. While SG-1 was missing, SG-5 completed the mission to P2X-555 in their place.
Cross Reference: Time Travel 1969
Episode Reference: 1969
Stargate Coordinates: 28-8-16-33-13-31