Chandra Yantra is installed and worshipped in order to appease planet Moon as well as to calm it if the moon is giving negative effects. The Planet Moon is one of the most prime planets in any Horoscope. Moon is considered as a planet but in actuality, Moon is a satellite of planet Earth and it revolves around Earth completing one revolution in around 27 days. Astrologically, it is considered as Queen in the planets (Sun is regarded as King). The planet Moon governs our Emotions, Will Power, Wealth, Health as well as all our thoughts. A person having a strong Moon (Moon in its own Sign - Cancer, Moon in its exaltation sign Taurus or Moon being aspected by naturally benefic planets like Jupiter) is strong in respect to his Will Power and Decisions & he is always a Positive thinker and never falls prey to negative states of mind like Depression. A person having a weak Moon can suffer from diseases of chest, lung infections, tuberculosis, blood related problems, mental problems as well as depression and diseases related to digestive system like diarrhea, dysentery, etc.
On the contrary, a person having an afflicted Moon (Moon in enemy sign like Capricorn, Aquarius, Moon in its Debilitation sign Scorpion, Moon with malefic planets like Saturn or Rahu) in his horoscope is always prone to nourish Negative Thoughts in his Mind, he is unable to adjust even with his intimate friends and family members and is never able to achieve success in his life which is full of miseries due to his own deeds resulting out of a Weak / Afflicted Moon. Moon is a female planet and it exhibits our Emotions, Happiness, Wife, Lover, Silver, Pearl, White color, Travels, as well as our Will power. Moon also controls the white part of our blood.