What is a house system, and which one is right?
There is more than one way to divide the sky into twelve houses, and the choice moves planets between houses near the boundaries. Placidus, the common modern default, divides by time; whole-sign, the oldest method, makes each house one whole sign; equal houses take thirty degrees each from the Ascendant.
Where astrologers disagree
This is the largest live disagreement in the field, and there is no calculation that settles it. If a planet sits near a cusp, another astrologer may place it in the next house and both are following a real tradition.
In the reference library: House systems: Placidus, whole-sign and equal, compared — and why none is “right”
Where you see this in OrbHeaven
Draw your own chart and this definition stops being abstract: the same term, with your numbers in it. Every placement, house and aspect, with the engine, the house system and the exact universal time printed underneath. No account, no email address, and nothing you type is kept.
No account, no email address, and nothing you type is kept.
The chart
What the picture is, and what the numbers on it are measuring.