 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 3705 is the last member of # 2 . From -125,000 till + 125 @,@ 000 only about ten series at both nodes each are needed for all the transits of Venus in this very long timespan , because both nodes of the orbit of Venus moves back and forward in time . 
 Thus after 243 years the transits of Venus returns . The 1874 transit <a href='drop_aux' title='1'><mark>is</mark></a>a member of the 243 @-@ years cycle # 1 . The 1882 transit <a href='drop_aux' title='2'><mark>is</mark></a>a member of # 2 . The 2004 transit <a href='drop_aux' title='3'><mark>is</mark></a>a member of # 3 and the 2012 transit <a href='drop_aux' title='4'><mark>is</mark></a>a member of # 4 . The 2117 transit <a href='drop_aux' title='5'><mark>is</mark></a>a member of # 1 and so on . However , the ascending node ( December transits ) of the orbit of Venus <a href='uninflect' title='6'><mark>moves</mark></a> backwards after each 243 years so the transit of 2854 <a href='drop_aux' title='7'><mark>is</mark></a>the last member of series # 3 instead of series # 1 . The descending node ( June <a href='uninflect' title='8'><mark>transits</mark></a> ) <a href='uninflect' title='9'><mark>moves</mark></a> forwards , so the transit of 3705 <a href='drop_aux' title='10'><mark>is</mark></a>the last member of # 2 . From -125,000 till + 125 @,@ 000 only about ten series at both nodes each are needed for all the transits of Venus in this very long timespan , because both nodes of the orbit of Venus <a href='uninflect' title='11'><mark>moves</mark></a> back and forward in time . 
Thus after 243 yrs the transits of Venus returns . The 1874 transit a member of the 243 @-@ years cycle # 1 . The 1882 transit a member of # 2 . da 2004 transit a member of # 3 and the 2012 transit a member of # 4 . Tda2117 transit a member of # 1 and so on . However , thdascending node ( December transits ) of the orbit of Venus move backwards after each 243 yeyrsoo the transit of 2854 the last member of series # 3 instead of series # 1 . The descending node ( June transit ) move forwards ,sooo thedaansit of 3705 the last member of # 2 . From -125,000 till + 125 @,@ 000 only about ten series at both nodes each r needed fir all the dansits of Venus in dis very long timespan , bc both nodes of the orbit of Venus move back and forward in time .