Ptolemy - A Greek philosopher who propunded the Helicentric theory.
Orbital period - This is the time taken by a planet to go once round the Sun.
Ophiuchus - the 13th zodiac.
Occult - refers to secret or mysterious doctrine which transcend our natural senses.
Music of the spheres - according to this the planets rode on giant crystal spheres which emitted a musical sound when moved.
Midheaven - An important angle in the birth chart which refers to the parent.
Magi Astrology - is a special form of astrology that has been developed by the Magi Society, which is a Chinese astrological society.
Lunation - this is the time taken by the Moon to go once round the earth and is approximately 29.5 days.
Jewish Astrology - Jewish views and the 12 Jewish zodiac signs.
Imum Coeli - this is the sign that corresponds to the fourth house and refers to wealth and property.
