The Galactic Centre of our Galaxy is at 26 degrees Sagittarius – note neither Planets or stars in Sagittarius are any nearer to the Galactic centre than elsewhere because they are at this point, the stars of the Milky way are nearest to Galactic centre the stars from other Galaxies than make up the Zodiac signs have their own Black Hole and Galactic centre thus alpha Centauri in the Centaur is much closer to Galactic Centre than the stars in Sagittarius.
Put in simplistic terms the Earth orbits the Sun and the Sun along with the other Stars in the Milky way orbits the Black Hole at its centre. All Galaxies have black holes at their centre. Galactic centre is the black hole in the centre of our Galaxy – Galaxy means milky and its name is derived from our very own milky way the spiral galaxy our Sun is part of.
