To find asteroids in your birth chart, you can use free online tools on websites such as Astrodienst . Montúfar says that to use asteroids in birth chart interpretations , you should pay attention to when they are placed at an angle to, or are tightly connecting with, natal planets. For example, if you have Eros The Lover in Cancer , you may crave emotional connection with partners; but if the asteroid is off in Libra, you may be more fickle with your romances.