The Ancient Egyptian Sun hieroglyph is Gardiner sign listed no. N5 for the sun-disc (Sun actions of the sun: rise). It is also one of the hieroglyphs that refers to the god Ra.
The sun hieroglyph is used in the Ancient Egyptian hieroglyphs as a determinative to refer to events of time, for example when referring to '"day xx" (of month yy').
Above hieroglyph indicates toward Sanskrit word R-h j%(jg), which means 'the fire, speed, love, desire, heat: The sign is showing the speed through a speed giver-wheel with axis. It is not the sun but a wheel, which is a symbol of speed.
The wheel has central or nave whole, not the sun.