Author Archives: Jack Case

Point Z represents the zenith of the observer’s position.  Point X represents the position of the celestial body and this point, if projected onto the Earth’s surface, would correspond to the Geographical position of the body. P and P1 are … Continue reading →

First Point of Aries.  In astronomy, we need a celestial coordinate system for fixing the positions of all celestial bodies in the celestial sphere.  To this end, we express a celestial body’s position in the celestial sphere in relation to … Continue reading →