text: how long does it take our solar system,to make one revolution around our black hole? b.c.  calenders sagittarius a* was determined to be the center of the milky way, about 26,000 light years from our solar system. we know the center is a black hole from observations of nearby suns in very fast orbits around it, showing high gravitational attraction. in 1999, knowing that sagittarius a* was the center of the milky way galaxy allowed astronomer mark reid and associates at the harvard-smithsonian center for astrophysics to calculate that our solar system takes approximately 226 million years to revolve around the galactic center.