Physics
Even after sunset, the air near the Earth's surface continue to receive heat due to

Terrestrial Radiation
Convection
Insolation
Conduction

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Physics
Why two thin shirts can keep us warmer than a single thick shirt in winter ?

Two thin shirts become thicker so prevent transmission of heat
Air layer between two shirts works as good conductor
Air layer between two shirts behaves like insulating media
No radiation of heat takes place

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