Major aspect
Opposition
Directly across the wheel: visible, and usually someone else's fault at first.
- Angle
- 180°
- Orb used here
- ±8°
- Temper
- usually difficult, and usually what builds something
An opposition puts two planets at opposite ends of the chart, in signs that are each other's counterweight. Unlike a square, the tension is legible: you can see both sides, which is exactly why it tends to get externalised.
The classic pattern is projection: living one end and meeting the other in other people, repeatedly, until the pattern is recognised. Worked with, an opposition becomes the widest field of view in the chart, because it is the only aspect that holds two full positions at once.
Where to go next
What it joins
An aspect is what two planets do to each other, so the pair matters as much as the angle. Read both ends before reading the opposition.
Its orb
This site allows ±8° either side of exact. One within a degree does far more work than one at the edge of its orb, which is why every orb is listed rather than assumed.
In your chart
Which of these you actually have, and between what. Cast your chart. Free, and it draws every aspect it finds.