Trip to history:

People have always been interested in the Venus transit. For example, Jan Hevelius wrote a book Venus in Sole visa about this phenomenon in 1662.

In 1769 there was the second transit of Venus in the 18 th century and it was also observed by many people and expeditions. Only the British sent 69 expeditions to observe it!

J Kepler managed to forecast the following Mercury and Venus transits but he did not live so long to observe it.

Next transit was forecasted for 4 th December 1639 by J. Horrocks and he also did the first measurements. E. Halley determined the sun parallax by observing the Venus transit and he counted the distance of the sun from our planet.

In 1761 there was a map sent to over a hundred places of visibility and the whole world expected the results of many British and French expeditions and astronauts from all over the world. Nevertheless, the parallax was still very inaccurate. The parallax was not precisely determined even in 1769 when many expeditions suffered terrible conditions.

It was only in the 19 th century when the technical development brought a big change of the situation.