 Thus after 243 years the transits of Venus returns . The 1874 transit is a member of the 243 @-@ years cycle # 1 . The 1882 transit is a member of # 2 . The 2004 transit is a member of # 3 and the 2012 transit is a member of # 4 . The 2117 transit is a member of # 1 and so on . However , the ascending node ( December transits ) of the orbit of Venus moves backwards after each 243 years so the transit of 2854 is the last member of series # 3 instead of series # 1 . The descending node ( June transits ) moves forwards , so the transit of <unk> is the last member of # 2 . From <unk> till + 125 @,@ 000 only about ten series at both nodes each are needed for all the transits of Venus in this very long <unk> , because both nodes of the orbit of Venus moves back and forward in time . 
