Vedic astrology gives the Moon primary importance because the Moon governs manas — the everyday mind, mood, instinct and emotional weather. The Sun (Atma Karaka) shows soul and identity; the Moon shows what you actually feel between Monday morning and Sunday evening. That is why a Vedic Rashifal speaks to the texture of your week far better than a Sun-sign column.
Each Rashi (sign) is ruled by a planet, occupies 30° of the sidereal zodiac and carries an element — fire, earth, air or water. Together those three attributes (lord, longitude and element) decide how a transit lands on you.