The paper reports the positive results obtained with a stationary Michelson-Morley interferometer operating during two consecutive years (2003-2005) in Bogota, Colombia. After subtracting the environmental periodical effects, there is still a periodic residual that is no longer correlated to the environmental variables. There is, however, a significant correlation between the daily fringe-shift residuals for each month and the velocity of motion of the earth relative to the center of our galaxy at that particular time. This hints to a possible dependence of the velocity of light in our terrestrial laboratory and the velocity of the earth. This result is contrary to the current model for the photon that postulates a constant speed of light. From our data we have calculated the solar velocity consistent with our observations: 500 km/s, right ascension 16h-40 min, declination -75°.