(from the article `astrology`) ...the course of his life on the basis of the positions of the planets and of the zodiacal signs (the 12 astrological constellations) at the moment ... Found on http://www.britannica.com/eb/a-z/g/19
Ge·neth`li·al'o·gy noun [ Greek geneqlhalogi`a astrology; gene`qlh birth + lo`gos discourse.] Divination as to the destinies of one newly born; the act or art of casting nativities; astrology. Found on http://www.encyclo.co.uk/webster/G/18
Genethlialogy (formerly also known as genethliacs or genethliacks) is the art or science practised by a genethliac, that is the casting nativities - drawing up a horoscope of the time of one's birth. Found on http://www.probertencyclopaedia.com/browse/AG.HTM