Global searching is not enabled.
Skip to main content


When people speak about the horizon generally, they mean the small circle of the visible horizon where the earth joins the sky; but in astrological calculation we refer to the celestial (or rational) horizon – a great circle which cuts through the centre of the earth and is always perpendicular to the zenith and nadir. This divides the chart into the upper (diurnal) and lower (nocturnal) hemispheres.  

» Glossary of terms