Half-sums. See "Mid-points." Halyian Houses. A house system based on the Albategnius system and named for the 11th century Arabian astrologer Albohazen Haly. Also known as the Albohazen house system.
In this I would include symmetries (aka midpoints or half-sums), and parallels of declination. Regarding antiscia, these may belong to the co-ordinates based on parallels of declination, since degrees that are in antiscion share the same declination.
See also: Symbol, Prediction, Part, Major Aspects, Interpretation
 
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