5) b. Why sunrise and sunset appear to us a little later respectively. By hoe much time the length of the day increases ? Draw a diagram to illustrate it?
Dear student,
The refraction of sunlight by the Earth's atmosphere cause the Sun to appear a little higher at the horizon than it actually is. Because of this refraction, the Sun appears little above horizon at noon .The Earth's atmosphere bends the path of the light so that we see the Sun in a position slightly different from where it really is. The magnitude of this effect varies with latitude, but it's strongest at the equator, where the Sun rises 2 minutes earlier than it would if the Earth had no atmosphere, and sets 2 minutes after it would if the Earth had no atmosphere.
Regards
The refraction of sunlight by the Earth's atmosphere cause the Sun to appear a little higher at the horizon than it actually is. Because of this refraction, the Sun appears little above horizon at noon .The Earth's atmosphere bends the path of the light so that we see the Sun in a position slightly different from where it really is. The magnitude of this effect varies with latitude, but it's strongest at the equator, where the Sun rises 2 minutes earlier than it would if the Earth had no atmosphere, and sets 2 minutes after it would if the Earth had no atmosphere.
Regards