Word origin · etymology
Historical English technical phrases.
Progression names advancing; solar arc names the Sun's angular travel; direction names a directed displacement. Secondary and primary distinguish different timing conventions.
How we know · epistemology
System-specific sources and conventions
This entry covers Secondary progressions / solar arcs / primary directions. Its cited texts document the methods or teachings being compared; any computed result depends on the stated inputs and rules. Historical attestation and reproducible arithmetic do not by themselves test a personal interpretation.
Astrodienst: chart types and progression conventions ↗Astrodienst: progressed angle alternatives ↗
Connected concepts
Terms used in this explanation
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.