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Earth In Space EQ: How does the Earth’s rotation and revolution affect our lives?

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Presentation on theme: "Earth In Space EQ: How does the Earth’s rotation and revolution affect our lives?"— Presentation transcript:

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2 Earth In Space EQ: How does the Earth’s rotation and revolution affect our lives?

3 Astronomy The study of the moon, stars and other objects in space EQ: How does the Earth’s rotation and revolution affect our lives?

4 Axis & Rotation Axis: The imaginary line that passes through Earth’s center and the North and South poles Axis: The imaginary line that passes through Earth’s center and the North and South poles Rotation: Earth spinning on its axis Rotation: Earth spinning on its axis EQ: How does the Earth’s rotation and revolution affect our lives?

5 Polaris Also known as the North Star. The north pole points toward the North Star EQ: How does the Earth’s rotation and revolution affect our lives?

6 On the equator, the earth rotates at a rate of _____ kilometers per hour. 1,600 kilometers per hour 1,600 kilometers per hour EQ: How does the Earth’s rotation and revolution affect our lives?

7 As Earth rotates eastward, the sun appears to move westward across the sky. EQ: How does the Earth’s rotation and revolution affect our lives?

8 Checkpoint: Why do the sun and moon seem to move each day? The sun and moon seem to move each day mainly because Earth is rotating on its axis The sun and moon seem to move each day mainly because Earth is rotating on its axis EQ: How does the Earth’s rotation and revolution affect our lives?

9 What causes day & night? The Earth completes one rotation on its axis during a 24 hour period The Earth completes one rotation on its axis during a 24 hour period As Earth rotates eastward, a location moves through sunrise (shadow), day (sunlight), sunset (shadow), and night (darkness) As Earth rotates eastward, a location moves through sunrise (shadow), day (sunlight), sunset (shadow), and night (darkness) EQ: How does the Earth’s rotation and revolution affect our lives?

10 Revolution Revolution:The movement of one object around another object Revolution:The movement of one object around another object One complete revolution around the sun is called a year One complete revolution around the sun is called a year http://www.classzone.com/books/earth_ science/terc/content/visualizations/es04 08/es0408page01.cfm?chapter_no=04 EQ: How does the Earth’s rotation and revolution affect our lives?

11 Orbit Earth’s path as it revolves around the sun Not quite a circle, it is a slightly flattened circle or oval in shape Not quite a circle, it is a slightly flattened circle or oval in shape EQ: How does the Earth’s rotation and revolution affect our lives?

12 What is one full rotation called? What is one complete revolution called? One full rotation is called a day One full rotation is called a day One complete revolution is called a year One complete revolution is called a year

13 Sharpen Your Skills: Earth moves at a speed of about 30 km/sec as it travels around the sun. What distance, in kilometers does Earth travel in a minute? An hour? A year? 1 minute (60 sec.) 1 hour (60 min.) 1 Day (24 hours) 1 Year (365 days)

14 Sharpen Your Skills: Earth moves at a speed of about 30 km/sec as it travels around the sun. What distance, in kilometers does Earth travel in a minute? An hour? A year? 1 minute (60 sec.) 1 hour (60 min.) 1 Day (24 hours) 1 Year (365 days) 1,800 km/min

15 Sharpen Your Skills: Earth moves at a speed of about 30 km/sec as it travels around the sun. What distance, in kilometers does Earth travel in a minute? An hour? A year? 1 minute (60 sec.) 1 hour (60 min.) 1 Day (24 hours) 1 Year (365 days) 1,800 km/min108,000 km/hr

16 Sharpen Your Skills: Earth moves at a speed of about 30 km/sec as it travels around the sun. What distance, in kilometers does Earth travel in a minute? An hour? A year? 1 minute (60 sec.) 1 hour (60 min.) 1 Day (24 hours) 1 Year (365 days) 1,800 km/min108,000 km/hr2,592,000 km/day

17 Sharpen Your Skills: Earth moves at a speed of about 30 km/sec as it travels around the sun. What distance, in kilometers does Earth travel in a minute? An hour? A year? 1 minute (60 sec.) 1 hour (60 min.) 1 Day (24 hours) 1 Year (365 days) 1,800 km/min108,000 km/hr2,592,000 km/day946,728,000 km/year

18 Leap year Earth’s orbit around the sun is 365 ¼ days Earth’s orbit around the sun is 365 ¼ days After 4 years, our calendar is about 1 day ahead of Earth’s orbit After 4 years, our calendar is about 1 day ahead of Earth’s orbit To line up our calendar with Earth, an extra day is added (February 29 th ) To line up our calendar with Earth, an extra day is added (February 29 th ) ¼ + ¼ + ¼ + ¼ = 1 day ¼ + ¼ + ¼ + ¼ = 1 day EQ: How does the Earth’s rotation and revolution affect our lives?

19 Seasons on Earth

20 Why is it colder near the poles? It is colder near the poles because the sunlight hits Earth at an angle and the sun’s rays are spread out over a larger area It is colder near the poles because the sunlight hits Earth at an angle and the sun’s rays are spread out over a larger area EQ: How does the Earth’s rotation and revolution affect our lives?

21 Latitude A measurement of distance from the equator A measurement of distance from the equator Expressed in degrees north and south Expressed in degrees north and south EQ: How does the Earth’s rotation and revolution affect our lives?

22 Why do we have such warm temperatures in the northern hemisphere during the season of summer? The Northern hemisphere is tilted toward the sun The Northern hemisphere is tilted toward the sun Therefore, the Northern Hemisphere gets a larger amount of direct sunlight causing longer days and warmer temperatures Therefore, the Northern Hemisphere gets a larger amount of direct sunlight causing longer days and warmer temperatures EQ: How does the Earth’s rotation and revolution affect our lives?

23 Why do we have fewer hours of daylight during the winter in the northern hemisphere? The Northern hemisphere is tilted away from the sun The Northern hemisphere is tilted away from the sun Therefore, the Northern Hemisphere gets a smaller amount of direct sunlight causing shorter days and cooler temperatures Therefore, the Northern Hemisphere gets a smaller amount of direct sunlight causing shorter days and cooler temperatures EQ: How does the Earth’s rotation and revolution affect our lives?

24 Solstice Two days each year when the noon sun is overhead at either 23.5ºsouth or 23.5 º north Two days each year when the noon sun is overhead at either 23.5ºsouth or 23.5 º north EQ: How does the Earth’s rotation and revolution affect our lives?

25 When do the summer and winter solstices occur? Summer – Around June 21 Summer – Around June 21 Winter – Around December 21 Winter – Around December 21 EQ: How does the Earth’s rotation and revolution affect our lives?

26 Equinox The two days of the year on which neither hemisphere is tilted toward or away from the sun The two days of the year on which neither hemisphere is tilted toward or away from the sun Means “equal night” because day and night are almost equal Means “equal night” because day and night are almost equal EQ: How does the Earth’s rotation and revolution affect our lives?

27 Vernal Equinox The day of the year that marks the beginning of spring in the Northern Hemisphere The day of the year that marks the beginning of spring in the Northern Hemisphere EQ: How does the Earth’s rotation and revolution affect our lives?

28 Autumnal Equinox The day of the year that marks the beginning of fall in the Northern Hemisphere The day of the year that marks the beginning of fall in the Northern Hemisphere EQ: How does the Earth’s rotation and revolution affect our lives?

29 Why are the days and nights during the seasons spring and fall more even or equal in length? The direct sunlight is more evenly distributed over the northern and southern hemispheres The direct sunlight is more evenly distributed over the northern and southern hemispheres The most direct sunlight during these seasons is on the equator The most direct sunlight during these seasons is on the equator EQ: How does the Earth’s rotation and revolution affect our lives?

30 What causes the cycle of the seasons on Earth? Earth has seasons because its axis is tilted as it moves around the sun Earth has seasons because its axis is tilted as it moves around the sun Depending on how much direct sunlight that our location receives at a particular time causes seasons Depending on how much direct sunlight that our location receives at a particular time causes seasons EQ: How does the Earth’s rotation and revolution affect our lives?

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32 Class Work and Homework Fill In Fill In What did I Learn What did I Learn Confused Confused Say Say EQ: How does the Earth’s rotation and revolution affect our lives? Read pages J 14 – J 21 Answer questions 1-5 on J 21, plus the following: 1. Why are the days and nights during the seasons spring and fall more even or equal in length? 2. When do the summer and winter solstices occur? 3. Why do the sun and moon seem to move each day?


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