This short ebook describes an approximate mathematical solution for Time Travel involving relativity and very brief time intervals. Time Travel is made possible by exploiting the fact that our universe literally blinks, off and on, at a very high frequency. 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 or engineering. The math is derived by taking Einstein's equation, E=mc^2, and taking the partial derivative with respect to time. Readers will note that the speed of light is not constant per Dr Daniel Gezari's important paper; "Lunar Laser Ranging Test on the Invariance of C." Each reader must comprehend that our universe literally blinks, off and on, approximately 1 trillion times every second (1.1 THz). For those unconvinced that our universe is blinking - please see the related ebook, "The First Periodic Table for Elementary Particles," which provides compelling mathematical evidence.