Two separate photos or observations of a planet or star may show the apparent position to change in relation to the background stars. This is called parallax. Astronomers translate this into an angular measure with the observer being the vertex of the angle. Then with trig you can calculate the distance to the object.
Greece introduced trignometry
How tall is something that is too high to measure.
nothing
Hipparchus
when he was an adult
astonomy
Hey use triangulation method refer book of +1
Trignometry
one of them is called trignometry, one is a protractor and the other is a good question...
hipparcus a greek mathematician
=1/2=0.5
yes