Bissextus – A new word… February 29, 2016 / Robin Definitions for bissextus February 29th: the extra day added to the Julian calendar every fourth year (except those evenly divisible by 400) to compensate for the approximately six hours a year by which the common year of 365 days falls short of the solar year. Share this: Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook Share on Threads (Opens in new window) Threads Share on Bluesky (Opens in new window) Bluesky Share on WhatsApp (Opens in new window) WhatsApp Email a link to a friend (Opens in new window) Email Print (Opens in new window) Print Like Loading... Related