In astrology, the Chart Ruler is the planet that rules the zodiac sign occupying the Ascendant. Because the Ascendant helps describe the chart’s orientation to the exact time and place of birth, its ruling planet is often examined as an important connecting factor within the natal chart. Astrologers may consider the Chart Ruler’s sign, house placement, aspects, and overall condition when exploring how different parts of the chart relate to one another. The concept is a specific application of planetary rulership: while a ruling planet may govern any zodiac sign, the term Chart Ruler refers specifically to the planet ruling the Ascendant.