Solunars by Aldebaran Sidereal Academy

It makes sense to view each angle as a wave say the AC/DC line is a trough and MC/IC a crest, when they come together the supposition of the waves would be a flat line (No energy) because they cancel each other.

I've always looked at it as a sine wave, with the AC/DC and MC/IC crests, and the troughs between. Like Gauquelin's charts. That puts the still points, the nodes, between, as the middleground.

I' ve been doing some thinking about this and have come to some conclusions. When we measure midpoints in PV longitude, if say SU/MO=AS, then SU/MO=MC always, to the same orb, since AS and MC are always exactly 90 degrees apart in PV longitude. Likewise if SU/AS=MO, then SU/MC=MO always. If this is correct when can we ever distinguish AS and MC contacts as COSI does? Or should we just write SU/MO=Angle and SU/Angle=MO and entirely give up distinguishing whether the angle is AS or MC? If we construct a 90-degrees dial using PV longitude rather than elliptical longitude, the AS and MC always coincide. Maybe Ebertin is right after all. Jim's SMA work with midpoints may have unearthed something new, not midpoints but similar, existing only near an angle. In that case we can distinguish SU/MO=AS from SU/MO=MC from SU/MO=DS from SU/MO=IC.

I think it's the EP measured in PV, not the ASC, but I could be wrong.

EP is measured in RA, see Jim's post above.