Parallax is the change in an object's relative position as seen from two different positions.
Mathematically speaking, the relationship between any two observation points and a distant object can be summed up in what's known as aSo long as some of the information is known – such as an angle between the lines of sight and the distance between observations – trigonometry can be used to deduce how far away the object is.
On increasingly larger scales, parallax angles can describe much longer distances, including those between Earth and other astronomical bodies such as the Sun or other nearby stars.To measure the huge distances separating objects in our inner Solar System, such as from Earth to the Sun, early astronomers had to widen the gap between observer positions to a scale of entire continents by jumping from one side of the globe to the other.
Centuries ago, astronomers took their telescopes across oceans to observe the inner planets as they eclipsed the Sun. Such planetary crossings A predicted transit of
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