Measuring distant objects | Triangulation, parallax & radar method | 11th physics | lesson 1

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hey guys this is the high school scientist and in this video i have explained some of the basic measuring methods... THE TRIANGULATION METHOD is used fro objects which are relatively close to you fro example measuring objects like trees and buildings...
PARALLAX METHOD is used to measure objects at extreme distance like near by stars or planets....
(NOTE : when measuring using parallax method please make sure that the imaginary parallel lines are in the path of the moon and perpendicular to the earths diameter )
AND YES i know that the earth is rotating and so its very difficult if not impossible to measure with the exact 90 degree angle... but its not necessary that the angle should be exactly 90 degree, if there is a variation in the angle it can be taken as an error and can be rectified using simple trigonometry and a calculator
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L01E01 : unification and reductionism

L01E02 : fundamental & derived quantities

L01E03 : units & measuring systems

L01E04 : radian & steradian

L01E05 : velocity & acceleration

L01E06 :angular velocity &angular acceleration

L01E07 : density at an atomic scale

L01E08 : momentum explained

L01E09 : energy

L01E10 : triangulation method , parallax method & radar method

L01E11 : dimensional analysis part 1

L01E12 : dimensional analysis part 2

L01E13 : mcq's class 11 1st chapter

L01E14 : mcq's part 2