Fasting on Thursday
This fast is observed to appease Lord Brihaspati and Lord Vishnu. It is believed that worshipping Lord Brihaspati helps to cure ailments related to stomach, gains strength, valor, and longevity blesses Childless couples with child, wealth, and fame is also endowed. People facing delays in marriage due to unexplained or unknown reasons can also observe these fasts.
About Fasting on Thursday
The fast for Thursday is kept for Lord Brihaspati and Lord Vishnu. Lord Vishnu who is also known as the preserver of the universe and Brihaspati is represented by the planet Jupiter of the solar system. It is also known as guru. Hence, Brihaspativar is also known as Guruvar. The gem associated with the planet Jupiter is yellow sapphire.
You can start from the first Thursday of shukla paksha of any month and should be done for minimum 16 Thursdays. This fast is observed from sunrise to sunset. Yellow is the most appropriate color on Thursday. After waking up, take bathe and wear yellow clothes. The person observing the fast shouldn't wash his/her head. Puja should be done with yellow flowers, yellow fruit like banana, rice cooked with Kesar, gram dal and yellow sweet like Besan ka ladoo, etc. Sandalwood is also used in this puja. While praying, your face must be towards east direction.
Meal is taking once and that too without salt. Thursday fast katha should be recited in the evening. If you want you can also donate yellow colored clothes in the evening. If you pray with full faith and a pure heart, all your wishes can be fulfilled.
People having a weak Jupiter according to their kundli observe these fasts. It is believed that worshipping Lord Brihaspati helps to cure ailments related to stomach. It also helps to gain strength, valor and longevity. Childless couples also do fasts on Thursdays. Wealth and fame is another reason behind the fasting on Thursdays. People facing delays in marriage due to unexplained or unknown reasons can also observe these fasts.
Mantras that can be recited for a more powerful impact are-
"Om Graam Greem Graum Sah Guruve Namah"
This is the Beej mantra of Jupiter. Reciting this 108 times bestows wealth, wisdom and reduces the negative effects caused by this planet.
Another mantra that can be chanted (108 times) is as follows-
"Om Hreem Kleem Hom Brihaspataye Namah"
The only thing to be kept in mind is that you must concentrate on the wish you want to get fulfilled and nothing else.