Thorbjorn, I think you know about the three-line 'Gayatri Mantra' which is considered to be the most important mantra (or verse) in Hinduism. It does not mention Sun explicitly, but talks about an effulgent creator deity, Savitr.
"Tat savituh vareniyam, Bhargo devasya dhimahi, Dhiyo yonah prachodayāt." (Exactly as it is found in RigVeda without 'Om' in the beginning or end)
Meaning:
That most adorable deity, we meditate on the divine radiance, may it increase our intellect.
It is a late RigVedic mantra, most probably created after Aryans had settled in India (3,000 BC ?)*. Aping the original Gayatri mantra, we now have three-line Gayatri mantras for all deities in the Hindu pantheon. Gayatri is a meter in Sanskrit poetry.
* I completely disagree with the European Indologists who say that RigVeda dates from 1,500 BC. At a minimum it dates from 4,000 BC when Indo-Iranian Aryans adopted the 'sacred thread' in the likeness of Bernard's Belt in the asterism of Orion. The sun rose on the day of vernal equinox at that time in the asterism of Orion, and Orion was considered the creator God (Prajapati - Lord of the people). Since then, the equinox has precessed by three months.
School students performing 'Surya Namaskar' on June 21, Yoga at Angkor Wat, in front of the President's House, 35,000 people attended, a Guiness Book record. Also all over India and the world. Hindu paganism is a vibrant living phenomenon. Broadway, Eiffel Tower, London, Beijing, Madrid.