yeh i was ignored by tom again. whats your problem? im a simpleton making simple observations. yet you ignore me all the time. im only pointing out flaws in your 'bible'
Perhaps if you improve your grammar you won't be so quickly dismissed.
In the 1600's special tinted lenses were popularized which allowed astronomers to look at the sun with less glare. Kepler and his associated could see Venus move nearer to the sun with every pass. Based on those historical observations of Venus moving nearer to the sun he predicted that it would eventually transit the sun. That's how it was predicted.
Citation please.
From
this page we read that Kepler predicts the Transit of Venus in a work called Rudolphine Tables
In 1629, as Kepler was preparing a set of astronomical ephemerides for the years 1629 to 1636, based on his new laws of planetary motion published in his Rudolphine Tables (Ulm, 1627), he noted that a transit of Mercury would take place on 7 November 1631 and a transit of Venus on 6 December of the same year. Although his calculations indicated that the latter transit would best be visible from the American continent, he cautioned European astronomers in his pamphlet De raris mirisque Anni 1631 (Leipzig, 1629) to be watchful as well.
Looking up the
Rudolphine Tables on Wikipedia:
The Rudolphine Tables (Latin: Tabulae Rudolphinae) consist of a star catalogue and planetary tables published by Johannes Kepler in 1627, using some observation data collected by Tycho Brahe (1546-1601). The tables are named as "Rudolphine" in memory of Rudolf II, Holy Roman Emperor.
So as we can see, it's a big historical table of past events, just as the Ancient Greeks and Babylonians had. Like lunar eclipses, the movements of the planets, and most everything else in astronomy, the Transit of Venus prediction was predicted based on analysis of previous events.