  The timing and duration of exoplanet transits has a dependency on observer
position due to parallax. In the case of an Earth-bound observer with a 2 AU
baseline the dependency is typically small and slightly beyond the limits of
current timing precision capabilities. However, it can become an important
systematic effect in high-precision repeated transit measurements for long
period systems due to its relationship to secular perspective acceleration
phenomena. In this short paper we evaluate the magnitude and characteristics of
transit parallax in the case of exoplanets using simplified geometric examples.
We also discuss further implications of the effect, including its possible
exploitation to provide immediate confirmation of planetary transits and/or
unique constraints on orbital parameters and orientations.
