[citation needed] Some relation between zodiac signs and cardinal points is highly probable to have been established for astrological weather forecasts and other purposes of prediction.
[1] An important systematic approach to astrogeography was developed by various astrologers such as Sepharial (Walter Gorn Old) in England,[2][independent source needed] and A. M. Grimm in Germany.
[citation needed] Both these systems assume that the Greenwich Meridian in metropolitan London has a 0° Aries fixed local MC, leaving the various regions of the globe to correspond with the 12 signs of the zodiac.
[7][independent source needed] In the course of the development of computer technology which made it easier to calculate more elaborate astrogeographical maps the Andersen system was published in 1974.
[citation needed] Another method in astrological cartography was based on findings by Don Neroman, Gustav Schwickert, Cyril Fagan, Roy Charles Firebrace and Donald A. Bradleyand developed from about 1930 until the 1960s.
Lewis' maps show all locations on the earth where planets were "angular" (rising, setting, on the zenith or nadir) at the moment of an event like a person's birth.