 Due to their great distance from the Earth , all stars except the Sun appear to the unaided eye as shining points in the night sky that <unk> because of the effect of the Earth 's atmosphere . The Sun is also a star , but it is close enough to the Earth to appear as a disk instead , and to provide daylight . Other than the Sun , the star with the largest apparent size is R <unk> , with an angular diameter of only 0 @.@ <unk> <unk> . 
