There are many people who cannot take up the task of reciting mantras regularly in the prescribed manner. Reasons may be many. For them fasting the day ruled by the concern planet which troubles them is the easiest method of propitiation of that planet.
The days ruled by seven planets are:
Fasting on Sundays:
It is taken ro pacify the planet Sun. Fasting on Sundays protect from malefic effects of the planet Sun . it is advisable to take up the fasting seriously if the vimshottari dasa natha is Sun.
It should be started from the first Sunday falling in shukla paksha of Jyeshta month. The maximum number of fasts to be observed is 30 and minimum is 12. During fasting only chapathis made of wheat flour with Jagery or honey should be taken. No other cooked food is permitted to take. The food should be taken before sunset. Fruits are allowed. And salt is restricted. The effect is more when Bija mantra of sun is recited for 108 times and at final Havana is performed.
Worship of Sun god is a must.
Fasting on Mondays:
This is for Planet Moon. Fasting should be started from the first Monday of the bright half of Jyeshta (month) Shukla Paksha. The maximum number of fasts is 54 and the minimum is 10. Food should be consumed without salt before sunset. Bhija mantra for moon is recited for 108 times. Havana is performed at the end of the fasting.
Worship of Lord Shiva and Goddess Durga is advised.
Fasting on Tuesdays :
The fast is started to nullify the evil effects of the planet Mars. It should be initiated on the first Tuesday of Shukla Paksha of Jyeshta month. The number of fasts should be 45 or 21. Only jaggery is advised during fasting on Tuesdays. Bija mantra of Mars is recited for 108 times. Havan is performed after the fasting.
Worship of Lord Lakshmi Nrisimha and Lord Subramanya gives excellent results.
Fasting on Wednesday:
To pacify the planet Mercury fasting is taken up on Wednesday. It should be started on the first Wednesday of Shukla Paksha of Jyeshta month. The number of fasts should be 45 or 21. Moong dhal and jaggery is taken as food along with fruits. Bija mantra of Mercury is recited for 108 times and Havana is done.
Worship of Lord Sri Ram protects from stress and mental agony.
Fasting on Thursday:
Fasting on Thursday s is done for the planet Jupiter. The fasting should be started from the first Thursday of Shukla Paksha of Jyeshta. The fast should be observed for 16 consecutive Thursdays. Good meal with sweets can be taken once during day time. Bija mantra of Jupiter should be recited for 108 times and concluded with Havan with poorna-Ahuti.
Worship of Lord Sri Dakshinamoorthy is advised.
Fasting on Friday:
Fasting on Fridays is for the Planet Venus. The fasting should be started from the first Friday of Shukla Paksha of Jyeshta. The fast should be observed for 20 Fridays. Bija mantra of Venus should be recited for 108 times. Food prepared with milk and milk products and rice can be taken. Havana is performed at the final. Worship of Goddess Mahalakshmi proves the best in all endeavours.
Fasting on Saturday:
Fasting is done to pacify the planet Saturn .The fast should be started from the first Saturday of Shukla Paksha of Jyeshta. The number of fastings is 19 Saturdays. Donating black clothes to the poor is advised. Bija mantra of Saturn is recited for 108 times and Havana is performed at the end. Urad dal can be had as a food during fasting before sun set.
Worship of Lord Venkateshwara and Sri Hanuman nullifies the evil effects of the planet Saturn.
Fasting on Saturday for Rahu:
Fasting is taken on Saturdays for the planet Rahu too . Fasting is observed for 18 Saturdays which should be started in the first Saturday of Shukla Paksha of Jyeshta. Bija mantra of Rahu is recited for 108 times and Havana is performed.
Worship of Goddess Shri Durga gives the good results.
Fasting on Tuesday for Ketu:
Fasting is taken on Tuesday for the planet Ketu. It should be taken up for 7 Tuesdays and should be started on the first Tuesday of Shukla Paksha of Jyeshta. Bija Mantra of Ketu is recited for 108 times and Havana is performed.
Worship of Lord Subramanya is recommended.
Gayathri Mantras of Different Gods:
Sri Brahma Gayathri—For Brilliancy in Knowledge
Sri Saraswathi Gayathri-----maintenance of mental peace and to have good education
SRI VISHNU GAYATHRI-- -- TO PROTECTS LUNGS AND THORASIC REGION
Sri Mahalakshmi Gayathri------Maintaining lovely hairs and wealth
Sri Siva Gayathri ----Digestive System
SRI DURGA GAYATHRI—FOR ALL SORT OF HEART DISEASE
Sri Subramanya Gayathri- -- Head and E.N.T
Sri Dhakshina moorthy Gayathri-----Ulcers
Sri RAMA Gayathri-----TO REMAIN WITH PERFECTION
Sri Krishna Gayathri---ALL ROUND PROSPERITY
Sri Sudarshana Gayathri-Rheumatism, polio etc
Sri Bhairav Gayathri------Dog bites and relief from poisons
Sri Anjaneya Gayathri----to shower good communication and Cure gastritis.
This apart Recitation of Navagraha Mantras will give effective relief in the recovery of diseases caused by the adverse planets. I write down such Navagraha Beeja mantras for ready reference.
Om Gruhni Suryaya Namaha 7000 japas
Om Som Somaya Namaha 11000 japas
Om Ang Angarakaya Namaha 10000 japas
Om Bhum Budaya Namaha 9000 japas
Om Bhrum Brihaspathaye Namaha 19000 japas
Om Shum Shukraya Namaha 16000 japas
Om Sham Shanaichcharaya Namaha 23,000 japas
Om Raang Rahave Namaha 18000 japas
Om Khem Ketave Namaha