The Science Behind Day and Night: Earth's Rotation Explained

The video explains the concept of day and night, highlighting how the Earth's rotation on its axis causes the sun to appear to move across the sky. It demonstrates the day-night cycle using a globe and lamp, and discusses global time differences. Fun facts about the Earth's rotation, solstices, and the sun's mass are also shared.

What is the primary reason we experience day and night on Earth?

• The sun moves around the Earth.

• The Earth rotates on its axis.

• The sun changes its brightness.

• The moon blocks the sun's light.

Why does the sun appear to move from east to west across the sky?

• The sun orbits the Earth.

• The Earth rotates from west to east.

• The Earth rotates from east to west.

• The sun rotates on its axis.

What is the imaginary line called that the Earth rotates around?

• Meridian

• Equator

• Axis

• Latitude

How long does it take for the Earth to complete one full rotation?

• 24 hours

• 365 days

• 12 hours

• 48 hours

When it is daytime in India, what is it in the United States?

• Afternoon

• Evening

• Nighttime

• Daytime

What is the shortest day of the year called?

• Eclipse

• Equinox

• Winter solstice

• Summer solstice

What is the longest day of the year known as?

• Eclipse

• Winter solstice

• Equinox

• Summer solstice

What percentage of the solar system's mass does the sun contain?

• 100%

• 99%

• 75%

• 50%

What defines daytime?

• From midnight to noon

• From noon to midnight

• From sunrise to sunset

• From sunset to sunrise

What is nighttime defined as?

• From sunrise to sunset

• From midnight to noon

• From sunset to sunrise

• From noon to midnight