Surya puja is for those who aspire for rise in career, gain of authority, sound health, prosperity, good eyesight, strength and courage, success, cure of chronic diseases like leprosy, heart ailment, nervous weakness, asthma etc.
Also those running Sun dasha or Sub-period should certainly perform this Surya or Sun Puja.
According to “Shrimadbhagvat”, SUN is situated in the center of the Universe between Heaven and the Earth.
Surya puja is to appease planet SUN as the planet SUN is the supreme power of the SOLAR SYSTEM. In astrology as well, SUN is always on top in every manner.