•What causes the change in daylight hours? The hours of delight change due to the tilting of the earth, for example the northern hemisphere tilts towards the sun the southern hemisphere tilts away from the earth, therefor the northern hemisphere experiences summer whereas the southern hemisphere experiences winter. thus the part more close to has more hours of daylight than that part away from sun.
•When is the earth closest to the Sun? The earth is closest to the sun during perihelion. At perihelion, the Earth is about 147.5 million km away from the Sun.
•Do the seasons and/or tilt depend on distance from the Sun? The distance from the Earth to the Sun is not a major component of the causes of the seasons. The seasons are mostly due to the axial tilt of the Earth. The change in distance of the Earth to the Sun is a very minor player. It is the tilt of the Earth that causes the Sun to be higher in the sky during the summer months which increases the solar flux. However, due to seasonal lag, June, July and August are the hottest months in the northern hemisphere and December, January and February are the hottest months in the southern hemisphere.
•Why don’t the planets crash into the Sun? planets that orbit the sun maintain their course thanks to the centrifugal force. Objects tend to remain in the same direction, the suns pull is at a right angle from the velocity but since the velocity is stronger than the suns pull the curve the same amount and turn back to right angles. The sun only alters the path a little, but enough to change its course into a curve, but not enough to change the course into the sun itself.
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