Two planets form an opposition when they sit at diametrically opposite points of the zodiac. The two energies stare each other down: it is a pull between two tendencies, a lesson in balance rather than a final choice for one side or the other.
Example: Sun opposition Moon puts the conscious and the emotional, the public self and the inner self, in tension — the aspect calls for making the two talk to each other rather than sacrificing one for the other.
Angle: 180°. Orb used on this site: 8°.
Nature: classified as tense — the energy does not flow naturally from one planet to the other, which creates friction; unlike the square, this friction plays out between two clearly identified poles rather than in direct action.