Question

why don't we feel Movement in aeroplane even if it flies at almost 1000 kmph

Answer 1

The Earth is spinning at 360 degrees every 24 hours. That's 15 degrees every hour, or four hours to turn the angle of an equilateral triangle, or six hours to turn through a right-angle. That's 47,520 times 'slower' than an old-style LP record. So not very fast at all in some sense.

You are correct that this slow turn translates to over 1,600km/h at the equator, but everything else including the atmosphere is moving with you at the same speed, so you don't notice much.

The North Star, Polaris, happens to be at the point in the sky directly 'above' the North Pole. As a result all the other stars in the sky appear to rotate around it as the Earth slowly spins - you may have seen some long-exposure star-trail photographs showing this apparent circular motion. Thus stars close in the sky to Polaris appear not to move much, while stars over the equator appear to move as quickly across the sky as the Sun (namely 15 degrees per hour).

Here in Australia we don't have an equivalent 'South Star' but the bright constellation of the Southern Cross is almost over the South Pole and it performs a rotation around a tight circle each day as the Earth spins.