Word origin · etymology
Descriptive mathematical phrase.
Solar names the Sun, arc its angular travel, and direction the displacement applied to chart factors.
How we know · epistemology
Symbolic angular mapping
A defined solar arc is applied to chart points by rule. Arc and year conventions must agree between programs; directed positions need not describe an actual configuration of planets.
Connected concepts
Mentioned in 1 other entry
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.