Definition of anti–sunward
: away from the sun : in the direction of the anthelion The most prominent optical feature of C/LINEAR was the tail of dust extending antisunward of the predicted position of the nucleus, which is also nearly due east. — H. A. Weaver et al., Science, 18 May 2001
antisunwardadjective These forces accelerate the ions rapidly in the anti-sunward direction, producing the narrow tails often seen in comets. — Daniel Boice et al., Encyclopedia of the Solar System, 1999
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