Reasons for the Seasons

By: Renee Moran


Earth is the third planet from the Sun. It has one satellite (moon) that obits it and four seasons (winter, spring, fall, summer). It takes Earth 365 days for one revolution around the Sun and 24-hours for one full rotation.
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Why do we have seasons?

Part 1

•The Earth’s rotation on its axis in a 24 hour period is the cause for day and night time. When only one part of the earth is facing the sun that is day and the side not facing the sun is night and then later that day the Earth spins and the other face is facing the sun with the other not.

•The Earth’s rotation on its axis is the planet it’s self-spinning and it takes 24 hours to do a full rotation.

•The Earth’s revolution is its orbit around the Sun and it takes 365 days for one full orbit, it also causes seasons.

•We have seasons for two reasons one is by the tilt of the Earth on its axis and two by its revolution around the sun.

•The seasons in the northern and southern hemispheres are different because when it is summer in the north it is winter in the south and when it is spring in the north it is fall in the south. They are always opposites. For when it is summer in the north they get more direct sun than in the south and vice versa.

•The equator does not experience dramatic change in seasons. This is because year round the equator gets about the same amount of direct sunlight because they are in the middle of the Earth and the tilt from the axis doesn’t really affect them.

•In our summer (northern hemisphere) the days are longer because of the Earth’s tilt on its axis toward the sun we get more sunlight so longer days. In winter we are tilted away from the sun so less sunlight and shorter days.

•The winter and summer solstices are when we have the longest and shortest days of the year. The summer solstice is on June 21st and is the longest day of the year; the winter solstice is on December 21st and is the shortest day.

•The spring and fall equinoxes are when there is equal days and nights. Spring equinox is on March 21st and the fall equinox is on September 21st.

•The North and South Pole have 4 seasons, but they only get effect from winter. They don’t get enough sun light to tell a difference in seasons.

•The equator does not have seasons at all unlike us. The countries on the equator have the wet and dry seasons. This is because the closer to the equator the hotter it gets.

•If there wasn’t tilted on its axis there would be no change in the seasons.

Part 2

•If Earth had a greater tilt degree then the season would be more extreme, and the tides would change.

•No I don’t think if there was a naturally occurring event that the seasons will change because the seasons are cause by the tilt of the Earth on its axis and its revolution around the sun. The only thing that maybe would change anything is if we had a massive earthquake and the tilt of earth changed.

•If the Earth was closer to the Sun then I think that our summer would be excruciatingly hot and it not be a very cold winter any more, in fact maybe not much of a winter at all.

•Ye s, when the seasons change I think the length of our shadows change. Shadows mainly depend on the time of day but think about the amount of direct and indirect sunlight we get in the different seasons I think that would also affect it a lot.

•I think that plants understand the seasons by measuring hours of darkness that occur in a 24-hour period and by measuring how much cold they have experienced.

•If we had a faster revolution then I think that the seasons would be shorter because the tilting toward and away from the sun would happen quicker thus shorter seasons.