This short technical note describes an approximate mathematical solution for Time Travel involving relativity and very brief time intervals. Limitations of the solution are discussed including possible error sources. Assumptions are made for small changes in the speed of light and for the Lighthouse Frequency, which has been described in previous papers. This paper will only be meaningful to those with a background in calculus, physics, and/or engineering. Each reader must comprehend that our universe blinks off and on, more than 1 trillion times every second.