Until the late 1700's, astrologers only used the planets that they could see, i.e. as far out as Saturn.  Since then, we've discovered the outer planets, Uranus, Neptune, Pluto and Chiron.  As these planets have become accepted into astrological lore, so their effects have become more specifiable.  Since the early 1990's, astrologers have had the option of including some of the major and minor asteroids in their charts.  To me, three of the largest asteroids do have an effect, these being Ceres, Juno and Vesta.  Today I'm looking at Juno.  For centuries Venus has been the planet of love, but now that Juno has come along, with its attachment to one to one relationships, and this frees Venus up.  I feel that Venus can now be seen in a fuller light as the planet of value and worth, regardless of whether those values are physical, sexual, financial, emotional or mental.  Stuck on relationship problems?  Look at the aspects to Juno in your chart if you're really trying to get to grips with the one to one situations in your life.