Because after the sun is 'overhead' in India, it takes roughly 5-1/2 hours
for the Earth to turn far enough to place the sun 'overhead' in London.
Our clocks are built to match what the sun appears to do.
Solar radiation is radiation heat transfer into the biosphere and trapped by the plant to the form of chemical energy. The motion of air and gas in biosphere due to contact with cold or hot surface involve conduction and radiation. The wind <span>carrying heat is convection.</span>
