why do we have time zones on earth
spins on an called its. Every 24 hours, the Earth makes a complete
Б or one full Б on its. We call each full a. Imagine shining a flashlight at a. Only part of the would receive light, while the opposite side of the would be dark. As rotates, different parts of Earth receive sunlight or darkness, giving us and night. As your on Earth rotates into sunlight, you see the. When your rotates out of sunlight, you see the Sun set. If we had one single time for Earth, noon would be the middle of the in some places, but it would be, and the middle of the night in others. Since different parts of Earth enter and exit daylight at different times, we need different time zones. In the late 1800s, a group of scientists figured out a way to divide the world into different time zones.
In order to build the time, they studied Earth's movements. As Earth rotates on its, it moves about 15 degrees every 60 minutes. After 24 hours, it has completed a full circle of 360 degrees. The scientists used this information to divide the planet into 24 sections or time zones. Each time is 15 degrees of wide. Distance between the zones is greatest at the and shrinks to zero at the poles, due to the of Earth. Since the is approximately 24,902 miles long, the distance between time zones at the is approximately 1,038 miles. The dividing lines begin at Greenwich, a suburb of London. The primary dividing line of is called the. is the angular distance between a point on any meridian and the at Greenwich.
The time at Greenwich is called (GMT). As you move west from Greenwich, every 15- section or time is an hour earlier than GMT, while each time to the east is an hour later. Having different time zones means that no matter where you live on the planet, your noon is the middle of the when the sun is highest, while midnight is the middle of the night. Let's take a closer look at how this works. Let's say you live in Charlotte, North Carolina, and you have a cousin who lives in Madrid, Spain. Charlotte is five time zones to the west of Greenwich, which is written as GMT -5. Madrid is 1 section east of Greenwich (GMT +1). This means Charlotte and Madrid are six time zones apart.
When your cousin is eating lunch at noon Madrid time, you are probably just getting out of bed to get ready for school. This is because at 12:00 p. m. in Madrid, it's only 6:00 a. m. in Charlotte. On the other hand, if you wanted to chat with your cousin online after dinner at 6:00 p. m. , it would already be midnight in Madrid! As the rotates on its axis, the shines on only one part of the Earth at a time. While the sun shines where you live, itвs nighttime somewhere else. When youвre eating your breakfast cereal, children in Paris are finishing the school day and children in Moscow are eating dinner. Children in Bangkok are going to bed and children in Sydney, are getting up for the next day of school.
It wouldnвt make sense for us to be on the same time. Instead, countries all over the world are divided into time zones, based loosely on longitudinal bands. Large countries, such as the and, may be divided into three or more time zones, but most countries fall in one zone. Fun Facts about Time Zone for Kids Many countries follow daylight saving time, which is designed to allow people to enjoy more waking hours during daylight. In most of the U. S. , our clocks spring forward one hour in the spring. They fall back one hour in the fall. As you move around the globe, youвll eventually reach a place where the time is either one day ahead or behind. This place is known as the International Dateline. Australia and a few other places are a day ahead of you.
When itвs Monday where you live, itвs Tuesday there. Before you call a friend overseas, make sure you know what time it is there. Otherwise, you might call your friend at 3:00 in the morning. Who wants to talk then? Time Zone Vocabulary Rotate Axis Time zone : division of time, based on the Earthвs rotation and the Sunвs path All about the Time Zone Video for Kids A video explaining why time zones were established and how it came to be. Time Zone Q A Question : How do you adjust the time when you cross into a different time zone? Answer : Cell phones and automatically adjust to a new time zone. You can move a watch forward or backward. Enjoyed the info? and. For lengthy info click.
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