Posted on August 20, 2024August 20, 2024 by adminHA, Hora Kona. Cos h = – tan Phi tan Delta If we want to know Hora Kona, HA at 1030 AM 12 – 10.30 = 1.5 hrs = 90 minutes = 90/4 = 22.5 degrees ! HA at 1030 AM = 22.5 degrees !