Prithvi Namaskar

I met my respected Guruji Sri Shailendra Sharma recently in Govardhan.  All of us have heard of Surya Namaskar.  I was astonished to learn from my Guruji that it has never been mentioned in the ancient yogic texts like Hath Yoga Pradeepika. Surya Namaskar is a later addition from someone. He mentioned that the prolonged practice of Surya namaskar is not conducive to health. Rather, my Guru mentioned that anyone doing surya namaskar ages faster than normal. So, come to think of it - is offering of water to the Sun advisable? So many people in India do it.  It is a fact that being an astrologer, I meet so many people day in and day out. But I have almost never come across anyone offering jal abhishek to the Surya regularly lead a very healthy and happy life. The person is likely to be facing one or the other problems in life - especially in business or profession. There is an astrological reason to it.
The planet earth is responsible for the billions and trillions of human and animals lives. We pray to so many Gods. We chant planetary mantras as per astrological texts. Why doesn't any text ask us to revere this planet on which we live our entire lives. Should we not chant mantras to propitiate earth? I think we should.