Mercury transits take place only around 13 times a century.
Transits of Mercury do not occur very often. In the period between 2000 and 2199, for example, they will happen only 27 times. The last one occurred in 2016 and the next won't be visible for another 13 years.
Transits only take place in these two windows because the orbits of Mercury and Earth around the sun are slightly tilted relative to one another, only overlapping at two points, known as nodes,These two nodes are located at points in Earth's orbit where transits could be possible in May or November. However, because the Earth and Mercury take different amounts of time to complete a full circle around the sun, we don't see transits every year.
The entire transit process can be split into four"contacts." The first is when the leading edge of the black dot representing Mercury comes into contact with the outside edge of the sun's disk. The second contact is when the trailing edge of the planet is in line with the edge of the sun's disk.
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