anti-sun|ˈæntɪsʌn| [anti-1.] The point in the sky diametrically opposite the sun; esp. a point opposite the sun in azimuth, of the same altitude as the sun. 1902Encycl.Brit. XXX. 705/2 Babinet located a neutral point or zone about as far from the anti-sun as was Arago's from the sun itself.