revision preference src: The rainbow's centre is diametrically opposed to the sun's position in the sky. More of the circle comes into view as the sun approaches the horizon, meaning that the largest section of the circle normally seen is about 50 % during sunset or sunrise. <SEP> tgt: Since the rainbow's centre is diametrically opposed to the sun's position in the sky, more of the circle comes into view as the sun approaches the horizon, meaning that the largest section of the circle normally seen is about 50 % during sunset or sunrise.