| Mission | Date/Time | Event |
| viking1 | 1975.08.20.21.22.00 | Launch on a Titan/Centaur rocket |
| viking1 | 1976.06.19.12.00.00 | Mars orbit insertion |
| viking1 | 1976.06.21.12.00.00 | New 1,513 x 33,000 km orbit for landing site certification |
| viking1 | 1976.07.20.08.51.00 | Lander separation from orbiter |
| viking1 | 1976.07.20.11.53.06 | Lander touchdown on Mars |
| viking1 | 1977.02.01.12.00.00 | Close approaches to Phobos |
| viking1 | 1977.03.11.12.00.00 | New 300 x 33,000 km orbit |
| viking1 | 1979.07.20.12.00.00 | New 357 x 33,000 km orbit |
| viking1 | 1980.08.07.12.00.00 | Orbiter attitude gas running low. New 320 x 56,000 km parking orbit to avoid collision with Mars before 2019 |
| viking1 | 1980.08.17.12.00.00 | Orbiter operations terminated after 1,485 orbits |
| viking1 | 1982.11.13.12.00.00 | Contact to lander lost. End of mission |