Day and night on Earth are caused by the planet's rotation around its axis and its position relative to the Sun. The Earth rotates from west to east, so places further east experience daybreak and nightfall sooner. One hemisphere of Earth is in daylight at any given time.Continue Reading
Earth rotates around its axis once every 23 hours and 56 minutes. For simplicity's sake, it's rounded off to 24 hours, and the difference is made up as an extra day every four years.
As a given point on the planet's surface rotates into the path of the Sun's rays, the rays can begin heating and giving light to the planet. The angle starts off very oblique, which causes the Sun to appear low in the sky. At the equator at midday, the Sun is almost directly overhead. This angle increases with distance from the equator. Throughout the day, the planet rotates, causing the location to move gradually out of the path of sunlight. This is nightfall, which is signified by the Sun slipping below the horizon.
Day and night last different lengths throughout the year depending on the tilt of Earth's axis. When the axis tilts toward the Sun, days are longer. When it tilts away, nights are longer.Learn more about Our Sun
In terms of radius, the Sun is about 109 times larger than Earth. The diameter of the Sun is approximately 864,948 miles while the diameter of Earth is only 7,926 miles. It is necessary to line up the Earth end-to-end 109 times to fit across the length of the Sun.Full Answer >
By every measure of size and mass, the Sun is much larger than the Earth. The Sun has a diameter of nearly 1.4 million kilometers and a mass 330,000 times that of the Earth. The Sun represents over 99 percent of all the mass in the solar system.Full Answer >
According to Astronomy.com, the Sun is nearly spherical with a very slight equatorial bulge, Earth is an oblate spheroid, and the Moon is somewhat lemon-shaped. These three bodies' shapes are influenced almost entirely by their gravity and centrifugal forces acting on them.Full Answer >
Day and night occur because of the rotation of a planet around its axis. The hemisphere of the planet that faces the sun at a particular moment experiences daylight, while the opposite side experiences darkness. The Earth rotates counterclockwise from west to east.Full Answer >