MOON (CHANDRA) YANTRA
The moon in Hindu astrology is known as Chandra. Shiva having Chandra adorning his head is known by name Chandradhara. The other name most popular is Soma. Chandra means 'shiny' and Soma is the sacred intoxicating drink that was used in Vedic rituals. Moon is known as Luna as in the words, 'lunatic' and 'lunar tides'. Ancients, both in East and West observed that mental makeup depends on Moon and the lunatics were observed to have a relationship with phases of Moon. This theory has been proved as well as disproved thrice by the psychologists! Moon's position is all important in the chart as the transit effects; the directional scale is determined by the position of Moon. As such, the predictions based on Moon sign represent the person more than the sun sign. Moon indicates changing mood. Moon is the karaka for mother, happiness, feminine beauty, mental status and eyesight. Remedial measures to Chandra will give peace of mind, healthy mental activity so that intelligence (represented by budha) is put to full use. Anxiety related disorders and mental disorders and water related diseases are cured by propitiation to Chandra.
Chandra Yantra, as the name signifies, negates the malefic effect of the Moon. Malefic effects of Moon are Urinary diseases, Lack of Mental Balance, insanity, nervousness, throat troubles, asthma, bronchitis etc Chandra Yantra is placed in the house or worn on any Monday of Shukla Paksha and is usually kept along with the image of Shiva. When moon is malefic in the chart or horoscope, Chandra / Moon Yantra is preserved in the house or pocket to negate the malefic affects of the Planet so that owner of that gets its blessing.
Mantra in English:
Stotra : Dahhi-shankha-tusharabham kshirodarnava-sambhavam namami shashinam soman sambhor mukta-bhushanam
When translated in English, it means:
"I offer my obeisances to the Moon god, whose complexion resembles white cheese, the whiteness of conch shells, and snow. He is the ruling deity of the soma-rasaborn from the ocean of milk, and he serves on the ornament on the top of the head of Lord Shambhu."