Questions regarding the star which is orbited by Earth, also the closest star to Earth.

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the formation of absorption lines in solar spectrum

It is said that absorption lines originate from regions higher in the photosphere where the gas is cooler. The gas should be in the process of ionization,recombination,ionization,recombination.... ...
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How to get the longitude/latitude from solar zenith/azimuth?

How do I get the longitude/latitude from zenith/azimuth? Or how can I position my sun in a 3d application? code extracted from here ...