Vishnusahasranam is a famous stotra (A hymn of praise) of ShriVishnu. Amidst recitation of these thousand Names, ShriVishnu is ritualistically worshipped with an offering of tulsi (Holybasil) leaves or lotus flowers.
The great Duttayogi H.H Sadanandswami has told through the medium of H. H Aaba Upadhyay that all the seekers should recite the Devikavach daily in the morning to receive protection for all the body parts and organs in the current adverse times.
Based on astrology and the Religious Scriptures the sun represents cosmic energy (pranshakti) and the moon, mental energy. Tithis (dates as per Hindu lunar calendar) are determined by the sun and moon.