This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
Nicholas Campion's history traces how the Hellenistic threefold ranking of the houses, angular, succedent and cadent, was carried forward through the Arabic and medieval Latin astrological traditions and into the astrology practiced today, a documented continuity that makes this one of the longer surviving pieces of technical astrological vocabulary.
That documented continuity matters for a modality entry because the Greek terms themselves, kentra for the angular houses, epanaphorai for the succedent and apoklimata for the cadent, did not always translate cleanly into Arabic and then Latin, and Campion's history records where a later tradition's own working definition of a house's strength shifted from the original Hellenistic statement, letting an entry note honestly when a modern description of a modality reflects a later development rather than the earliest documented version.
Campion also situates the threefold house ranking within the wider historical argument over how much weight house position should carry against sign and aspect, a documented technical debate within the practicing tradition itself rather than a settled point every astrologer across every period has agreed on.
An entry therefore uses Campion's history for that documented chain of transmission and technical debate, alongside the earlier primary handbook for the scheme's original statement.