Hokuto no Ken: Legend of Heroes

Both are short cgi anime, which have some interesting fight scenes. Also, both anime deal with astrology and are related somehow to constellations. 

Both are recent cgi remakes of famous classic anime. They both focus on a manly protagonist, whose goal is to bring peace and freedom. 

Riki-Oh and Hokuto no Ken are similar both thematically and stylistically. The events both happen in a post-apocalyptic world, where the main protagonist is a roaming martial arts master with a strong sense of justice and muscular physique. These two anime also share the same theme: that of brotherly conflict.