Our planet Earth is an important frame of reference for Western astrology. Signs Aries through Pisces and houses one through twelve show, respectively, HOW energies are expressed and WHERE in a person's life they operate. It is your location at a particular place on EARTH at a specific birth time that determines where the astrologer will "hang" your natal horoscope chart's Ascendant and first of twelve house-signs.

The calculation for a specific place of birth and time of birth on EARTH accounts for the yet grand difference between two people born on the same day and year.