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. Each reader must comprehend that our universe blinks, off and on, approximately 1.1 trillion times every second. Equation is solved by using Einstein's Special Theory 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 of the Invariance of C." The speed of light was found to be increasing approximately 3 meters per second each year. This paper will only be meaningful to those with a background in calculus, physics, and/or engineering.