They got to know with the photographs from the U - 2 spy plane.
<em>Hope this helped! :)</em>
Answer:
he World Fair Trade Organization has declared this week to be World Fair Trade Week. "Fair trade" is quite the buzzword in commerce these days and is generally associated with agricultural products. Chief among those is coffee. The popularity of fair trade coffee is undeniable. But what even is "fair trade" and what does it entail? How "fair" is it? Or is it just a marketing gimmick? James Harrigan and Antony Davies get into the nitty-gritty of this and more in this week's episode of Words and Numbers.
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Popular sovereignty is the principle that the authority of a state and its government are created and sustained by the consent of its people, through their elected representatives, who are the source of all political power.
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I learned this not too long ago too!
I think the answer you are looking for is parallax. Hipparchus used parallax to not only measure the distance from the sun, but also the moon. Although he was off my a couple hundred yards or so he actually measured the moon before the sun.