The 60 degree angle takes as its reference the signs of the elements closest to, and compatible with, the current one.
For example: fire with air and vice versa, or earth with water and vice versa.
Together with the trine, it is considered a good aspect, because the influences of one planet are in harmony with the second, bringing ease and a natural talent, especially when the native chooses to refine that talent.
The houses involved also take part in this harmonious contact between the two, and reveal the sectors that cooperate with each other.
There are sextiles that do not fall in compatible signs, when one of the planets or points is at the beginning of a sign and the other at the end of another sign.