L>TimeTIMETime is based upon the rotation of the earth. The earth turns once on it"s axis in 24 hrs. This rotation is a full360�. So, in one hour, the earth turns 15�. Eincredibly 4 minutes, the earth has turned one degree. In one minute oftime, the earth has turned 15 minutes of arc. So, every 4 secs of time, the earth rotates one minute of arc. Each of the unlimited meridians has a different time as its place loved one to the sunlight transforms throughout the rotation. When the sunlight passes directly over a meridian is noon. Here, in this simple treatment of time, we will certainly not deal withthe equation of time or the result of the earth"s rdevelopment and also the shape of the orbit. It is imhandy, though, forall longitudes to have their very own time, so time areas which share the time of a central meridian were devised. Inthis exercise, we will additionally not deal with the political and also cultural adjustments to the borders of these areas. Each time zone is 15� wide, with the Central Meridian being a multiple of 15�. This is situated in the facility of thebelt which shares that time, so the moment zones extfinish 7 �� on either side of the main meridian. Due to the fact that the earthrotates 15� in one hour, each time zone shares the exact same hour. The Prime Meridian or Greenwich time is used as a base. Since the earth rotates in a counterclockwise directionas soon as perceived so that the north pole is visible, the sunlight rises first in the east and also sets in the west. Thus, noon reachesthe Prime Meridian prior to it reaches the USA. Thus, locations to the eastern have a later time than areas to thewest. At 30�W, the time would certainly be two hrs previously than at the Prime Meridian. At 30�E, the time would certainly be twohrs later on than at the Prime Meridian. The new day first starts once midnight reaches 180� or the International Dateline. As midnight moves aroundthe globe, the old day is disshowing up at 180�. Except ideal at midnight at 180�, two days constantly exist at any type of oneminute. Use the following map to show the vital features for time.1. Draw a red line on the International Dateline.2. Draw a yellow arrowhead to present in which direction the moment is previously in the day. Label it EARLIER.3. Draw a purple arrowhead to show in which direction the time is later on in the day. Label it LATER.4. Use a pencil and a ruler to draw the generalized boundaries for each of the time areas.5.


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Using this map, identify the time and day for each time zone if it is 3 p.m. on Wednesday at Greenwich,England also.(Keep in mind the typographical error in the message on web page 25 wbelow a division sign must have actually been put quite than aplus sign, 360 divided by 24 = 15 levels per hour.)
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