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Understanding Solar Time and Global Time Zones

This lesson explores how we determine time across different cities and time zones around the world. We will examine why local time differs in various locations, using Greenwich Mean Time (GMT) as a reference. Students will engage in activities to find the current times in cities like Chicago, Miami, and Los Angeles. Additionally, they will learn about the Earth's rotation rate, how it correlates with time zones, and the significance of longitude in this context. Please read pages 32-35 in your UPCO book for further insights.

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Understanding Solar Time and Global Time Zones

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  1. Mr. Cesaire Solar Time Martin Van Buren High School

  2. Aim: How do we determine the time at different cities? • Do Now: In your notes, explain why our local time is different in other parts of the world. • HW: Read and be familiar with pages 32-35 in your UPCO book.

  3. Question- • Who can tell me the current time in Chicago, Illinois? • Miami, Florida? • Houston, Texas? • Los Angeles, California? • Honolulu, Hawaii? • London, England?

  4. How do we determine the different times around the world? • If you have the following: • Green review book-read pages 13-14- solar time and clock time • Answer the following in your notes: • What is Greenwich Mean Time (GMT)? • How many degrees does the Earth rotate per hour? • How is this determined?

  5. Solar time- the time of day at a specific longitude. • You can find your local time based on the current solar time at Greenwich, England (GMT). • Any location west of the Prime Meridian (GMT or UTC) is behind. • Any location east of the Prime Meridian (GMT or UTC) is ahead.

  6. It takes the Earth to rotate once every 24 hours; or 360 degrees. • 360 degrees/24 hours=? • Now you try to find the times at different cities. • Lines of longitude are 15 degrees apart.

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