Variables: time, weather, fuel temp, manufacturing tolerances, turbopump response time to commands, gimbal response time to commands, etc.
Targets: inclination, semimajor axis of altitudes, orbital eccentricity, longitude of the ascending node, true anomaly adjusted for launch time and ascent profile, argument of the periapsis.
So that's six deployment targets per satellite deployed, on hardware that is exposed to vacuum, variable 0-3 G's acceleration between both stages, heavy vibration and acoustical forces, temperature swings, radiation, etc.
However, I concede, SpaceX spaceflight engineers do _not_ have to target IE 6 anymore.
Targets: inclination, semimajor axis of altitudes, orbital eccentricity, longitude of the ascending node, true anomaly adjusted for launch time and ascent profile, argument of the periapsis.
So that's six deployment targets per satellite deployed, on hardware that is exposed to vacuum, variable 0-3 G's acceleration between both stages, heavy vibration and acoustical forces, temperature swings, radiation, etc.
However, I concede, SpaceX spaceflight engineers do _not_ have to target IE 6 anymore.