Astrology is the study of the movements and relative positions of celestial objects as a means for divining information about human affairs and terrestrial events. In the Indian astrology system, there are 9 planets,12 zodiac signs, 27 Nakshatras & 144 chart combinations. Indian astrology system follows a calendar based on constellations. It has the Moon in the center. 

The Moon governs the mind and emotions. Moon is the fastest moving planet in the Zodiac and 'no event is possible without Moon's support'. Those who know a bit of western astrology would know that there is a 'void of course' principle in western astrology which means that if there are no aspects to Moon, no event will take place. As such, both the luminaries are given equal importance but Moon because it governs the mind has been given prime importance in Vedic or Moon astrology. As per Vedas and Shastras, there are five elements in total, which are:

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Fire
Water
Earth
Air
Sky

All these five elements are taken into consideration while studying a horoscope, along with Constellations and Rashis or Moon sign. The fifth element sky is given utmost importance. Ascendant is the most effective point in anyone's chart because it signifies 'self' and this point (ascendant) is ruled by the sky element.

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