Question

how is time calculated for the sun's light to reach Earth​

Answer 1

Answer:

The Hour Angle converts the local solar time (LST) into the number of degrees which the sun moves across the sky. By definition, the Hour Angle is 0° at solar noon. Since the Earth rotates 15° per hour, each hour away from solar noon corresponds to an angular motion of the sun in the sky of 15°.

Answer 2

$\huge\bf\underline\mathfrak\red{Answer :}$

$\sf\underbrace{Time \: taken \: :-}$

• $\text{8 minutes and 20 seconds.}$

$\huge\bf\underline\mathfrak\red{Explanation :}$

• It is fact that speed of sunlight from the sun is same as the speed of light, i.e. 3×10⁸ m/s.
• Very small particles called photons that are produced from the sun's surface must reach the surface of Earth while travelling through the space in the vaccum.
• It is calculated that the estimated distance between the sun and the eart is about 150.15 million km, therefore light takes 8 minutes and 20 seconds to reach the surface of Earth.

$\huge\bf\underline\mathfrak\red{Learn \: More :}$

• Photons are said to be very small particles which makes up the light.
• Light doesn't need any medium that would assist in it's propogation.
• Light has the capability to behave as both wave and particle according to the situation. This tendency is called wave-particle Duality.
• Light shows many wonderful natural phenomenon. Some of them includes reflection and refraction.