What is a house cusp?
The line where one house ends and the next begins, given as a degree of a sign. In OrbHeaven’s Placidus charts the 1st cusp is the Ascendant and the 10th is the Midheaven; with whole-sign houses each cusp is the start of a sign instead. A planet within a degree or two of a cusp is usually read as belonging to the house it is about to enter.
In the reference library: House cusps: the boundaries, how the system and birth time set them, and planets near a cusp
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.