The Sextile . This is the aspect of opportunity. The Square . Square cause the friction and the hurdles that causes us to grow and become productive. The Trine .
Trines bring about ease and comfort.
The opposition . As the name implies, opposition are obstacles that must be resolved. Note that Astrodienst places the number of degrees and minutes that the aspect deviates from the precise aspect in the box under the aspect symbol. The deviation is called the orb. It appears to me that the orb allowed by Astrodienst is too great.