3 ms·East on Earth is the direction in which we rotate. Should be the same for a galaxy.by ajuc 7y agoEast on Earth is the direction in which we rotate. Should be the same for a galaxy.hanniabu 7y agoThat's because earth can be viewed as a plane. The galaxy can't, you need a median.ajuc 7y ago1. Milky Way is much more like a plane than Earth 2. it doesn't matter anyway any object which rotates can have direction named basing on that rotation