Refers to someone who worships the sun or is devoted to solar phenomena.
Los heliastas se reunieron en la cima de la montaña para rendir homenaje al sol naciente cada mañana.
The heliasts gathered at the top of the mountain to pay homage to the rising sun every morning.
El heliasta se levanta al amanecer para ofrecer sus oraciones al sol.
The heliast rises at dawn to offer his prayers to the sun.