I have been able to decipher Na,Ma Si. Please check and offer opinion. This blog is exploratory in nature. Constructive suggestion for improvement of content is welcome.
One may recall the Shiva shrines/Shiva Lingas aligned to Winter Solstice in India
Inti Watana is believed to have been designed as an astronomic clock or calendar by the Incas(wiki)
The Margabandhu, Temple Tamil Nadu has a stone that is is used as an Astronomic clock.
Now watch this video clip.