There are multiple definitions of both horoscope and astrology. In one simplistic view of astrology it is the assumption that the life on earth is influenced by the solar system and the alignment of plants at the moment of birth. There are four elements that form the basic principles of life and plotted in a circle divided into 12 slices representing various constellations. Fire is composed of three signs Aries, Leo, and Sagittarius. Air has the signs of Libra, Aquarius, and Gemini. Water is composed of the constellation of Cancer, Scorpio, and Pisces. Earth is the constellation of Capricorn, Taurus, and Virgo. Some say there is a fifth element which describes the soul or spiritual aspects.
The horoscope is a picture of the location of the Sun, Moon, and Planets at the time of birth. It cannot predict what is going to happen. This becomes overlapped with the four personality types (A, B, C and D) There is no scientific proof of any relationship between the four personality types and the four horoscope birth signs other than opinions of people. Similarly, there is no scientific proof that there was ever a big bang other than opinions of people. Therefore, everything must be on the table as to its validity or invalidity.