The revolution free essay sample

Therfore equitorial regions are warm during most of the year, amnd do not experince very cold temperatures. They tend to experince on long warm season interrupted by periods of drought and rainfall each year. Regions far away from the equator, in middle and high latitudes, have for seasons-spring, summer, autumn and winter. Summer and winter are usually the longest. Autumn and spring are shorter seasons which occur between winter and summers. Fig 1 . 1) it) Varying lenths of day and night at different times of the year The Earths axis is inclined at an angle of 661/20 . this eliptic plane is the path which the Earth revolves around the sun. its this inclination that causes differences in the lenth of days and nights in the nothern and southern hemisphere. When it is summer in the nothern hemisphere, longer daylight is experinces than night time. On 21 June, all areas in the northen hemisphere experince the longest day and shortest night. We will write a custom essay sample on The revolution or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page Similarly, during the southern Summer, days become longer than nights, reaching aclimax here areas south of the Antarctic Circle experince 24 hours of daylight. iii) Changes in the altitude of the midday day sun. The movement of the Earth in its orbit around the sun creates apparent cahnges in the position of the midday sun. The sun is vertically overhead at the equator twice a year (called equinox)that is, on 21 march and 23 september . At these two periods, the at the Tropic of Cancer (231 /2N). This is called summer solstice. n Dec 22 at the tropic of Capricon (231/2 ON)in the Southern hemisphere its called Winter solstice. This means that sun appears to move towards the north , then back to the equator , hen towards the south and back to the equator. 2. Effects of Earths Rotation The movement of the Earth on its axi is known as rotation. Nomally the Earth moves in an anticlockwise manner that is from West to East. It takes 24 hours to complete one rotation. Through an angle of 36 00. This means that it rotates through 150 in one hour or through 1 degeree in every 4 minutes. The rotation of the Earth causes the following events: i) Creates day and Night- daytime occurs when one side of the Earth faces the sun , while the opposite remains in darkness or night time. The length of night varies from equatot towards the poles. Places along the equator experinces 12 hours of day time and 12 hours of night-time as shown (Fig 1. 2) it) The sun is visible for 24 hours at the Arctic Circle when it is overhead at the Tropic of cancer (231/20 N) in the nothern hemisphere in June iii) It causes the diflection of wind and ocean currents to the right in the Nothen hemisphere and to the left on the southern Hemisphre. This is as aresult of Coriolis Effect which is an apparent curventure of global winds, ocean currents and anything else that moves freely across the Eaths surface, due the rotation of the earth on its axis v) It causes the ising winds and falling ocean tides v) It causes a difference of 1 hour between two longitudes Far Sides and Moon Phases It takes about 29 days for the moon to make one complete orbit around the Earth. Thats also how long it takes the moon to make one rotation around its axis. Because the moons rotation and orbit take the same amount of time, we always see the same face of the moon no matter when we look at it. If the moon didnt rotate, we would be able to see all sides of its surface. Likewise, if the moons rotation were faster or slower, wed eventually get a glimpse of the entire moon. Gravitaional force. So why does the moon rotate only once each time it orbits the Earth? This is due to the force of gravity. The pull on the moon of from the Earth has slowed the moons rotation down to its current speed. Its rotation is locked with the time it takes to orbit the Earth. Interestingly, the moon is doing the same thing to the Earth. Ever feel like the days are getting longer? They are. But the change is so gradual youd never notice it. Still, in a few billion years, the Earths rotation will match the time it takes the moon to orbit the Earth. By that time, the moon and Earth will have drifted apart from ach other a bit, which means it will take a little longer for the moon to travel around the Earth to the tune of about 40 days or so. That means that in the future, one Earth day will equal 40 of our current Earth days, or about 960 hours. Once the Earths rotation matches the time it takes for the moon to orbit the Earth, the same side of Earth will face the moon all the time. Does that mean that if you were to travel through time to the future, travel to the right spot on Earth and stare up at the sky youd always be able to see the moon? The answer is no, and it has to do with the phases of the moon. A common misconception about the moon is that a new moon occurs when the Earth blocks light from the sun, casting the moon into shadow. In fact, during a new moon the moon is between the sun and the Earth. Imagine that youre in a room that has only one light source shining into it from one side. Someone walks between you and the light source. You wouldnt be able to make out any details, but you could see the person in silhouette. Thats exactly what a new moon is. A full moon is when the Earth is between the moon and the sun. Going back to our example, imagine that you have your back to a light source and someone is standing n front of you. Youd be able to see that person clearly. Thats the same as a full moon. Whether its a full moon or a new moon, youre still looking at the same side of the moon the near side. During a new moon, youre looking at the near side during lunar nighttime. With a full moon, its the near sides version of noon. So theres no permanent dark side of the moon, but there is a far side thats still mostly a mystery to us. Because the moons bulk would block radio signals to and from the Earth, it may be years before engineers come up with a way to explore the far side to a greater extent.