Word origin · etymology
English compound with Latin-derived cusp.
Cusp comes from cuspis, point. A house cusp is the marked boundary or beginning point of a house.
How we know · epistemology
System-dependent boundary
A cusp is reproducible only after a house method is chosen. A planet can change house when the method changes without changing its sky position; boundary proximity should be reported explicitly.
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Terms used in this explanation
Mentioned in 2 other entries
These links connect subjects and terminology. They do not establish a shared historical origin.
Sources & provenance
Use the citations beside each section to distinguish a calculation convention, a historical teaching and an editorial example.