 NASA maintains a catalog of Venus Transits covering the period 2000 BCE to 4000 CE . Currently , transits occur only in June or December ( see table ) and the occurrence of these events slowly drifts , becoming later in the year by about two days every 243 @-@ year cycle . Transits usually occur in pairs , on nearly the same date eight years apart . This is because the length of eight Earth years is almost the same as 13 years on Venus , so every eight years the planets are in roughly the same relative positions . This approximate conjunction usually results in a pair of transits , but it is not precise enough to produce a triplet , since Venus arrives 22 hours earlier each time . The last transit not to be part of a pair was in 1396 . The next will be in 3089 ; in 2854 ( the second of the 2846 / 2854 pair ) , although Venus will just miss the Sun as seen from the Earth 's equator , a partial transit will be visible from some parts of the southern hemisphere . 
 NASA <a href='uninflect' title='1'><mark>maintains</mark></a> a catalog of Venus Transits covering the period 2000 BCE to 4000 CE . Currently , transits occur only in June or December ( see table ) and the occurrence of these events slowly <a href='uninflect' title='2'><mark>drifts</mark></a> , becoming later in the year by about two days every 243 @-@ year cycle . Transits usually occur in pairs , on nearly the same date eight years apart . This <a href='drop_aux' title='3'><mark>is</mark></a>because the length of eight Earth years <a href='drop_aux' title='4'><mark>is</mark></a>almost the same as 13 years on Venus , so every eight years the planets are in roughly the same relative positions . This approximate conjunction usually <a href='uninflect' title='5'><mark>results</mark></a> in a pair of transits , but it <a href='negative_concord' title='6'><mark>is</mark></a> <a href='negative_concord' title='7'><mark>not</mark></a>precise enough to produce a triplet , since Venus <a href='uninflect' title='8'><mark>arrives</mark></a> 22 hours earlier each time . The last transit <a href='negative_concord' title='9'><mark>not</mark></a>to <a href='negative_concord' title='10'><mark>be</mark></a> <a href='negative_concord' title='11'><mark>part</mark></a> of a pair was in 1396 . The next will be in 3089 ; in 2854 ( the second of the 2846 / 2854 pair ) , although Venus will just miss the Sun as seen from the Earth <a href='null_genetive' title='12'><mark>'s</mark></a>equator , a partial transit will be visible from some parts of the southern hemisphere . 
NASA maintain a catalog of Venus Transits covering da period 2000 BCE to 4000 CE . Currently , transits occur only in June or December ( see table ) and tdaoccurrence of these events slowly drift , becoming later in the year by about two dayz every 243 @-@ year cycle . Transits usually occur in pairs , on nearly thdaame date eight years apart . dis cause the length of eight Earth years almost the same as 13 yrs on Venus , so every eight yeyrshedaanets r in roughly the dae relative positions . Tdisapproximate conjunction usually result in a pair of transits , but it ain't precise enough to produce a triplet , since Venus arrive 22 hours earlier each time . The last transit to ain't no part of a pair was in 1396 . The nxt will be in 3089 ; in 2854 ( the second of the 2da / 2854 pair ) , although Venus gon just miss the Sun as seen from the Earth  equator , a partial transit will b visible from sum parts of the southern hemisphere .