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Our Solar System 05: The Earth in Space
Transcript of Our Solar System 05: The Earth in Space
Hello, students, today you will be learning the Earth-Moon-Sun system and the causes of the seasons. You will also learn about different lengths of day and night and how the size of the moon appears on Earth.
Causes of the Seasons-
Size of the Moon as it appears from Earth.
The earth and moon are not really that far apart considering the lengths of earth compared to other planets. The average distance between Moon and Earth is approximately 30 times Earth's diameter. When the moon is at apogee, it is 405,500 km away from earth. When the moon is at perigee, it is 363,300 km away from the earth. Scientist like when the moon is at perigee because they can study the moon better. The moon is 11% farther from Earth than it is at perigee.
Different lengths of day and night-
Because our earth rotates on it axis, we have day and nights. It takes earth 24 hours to spin completely around. Earth is on a tilt, if it wasn't we would have the same seasons for the rest of our lives. Since earth is on a tilt, some areas receive a lot of sun, other don't. During the winter in the Northern Hemisphere, it doesn't receive a lot of sun. That is way days are shorter. But, during the summer, the northern hemisphere receives more light than the southern hemisphere. Days are long in the Northern Hemisphere.
Make sure you pay attention and listen. You will have to complete a small activity at the end of the lesson, so pay close attention. Hope you students do great on the activity and have fun learning.
The seasons occur as earth moves on its orbit. The seasons you would get are summer, winter, autumn, and spring. Make sure students you look closely at the image.
Winter solstice- Known as the winter solstice is the first day of winter in the Northern Hemisphere. The sun is directly overhead at the Tropic of Capricorn. The Tropic of Capricorn is located at 23.5° South latitude.
Summer solstice- known as the summer solstice is the first day of summer in the Northern Hemisphere. The sun is directly overhead at the Tropic of Cancer. The Tropic of Cancer is located at 23.5° North latitude.
Autumnal Equinox- Known as the autumnal equinox is the first day of autumn in the Northern Hemisphere. The sun is directly overhead at the equator.
Vernal Equinox- Known as the vernal equinox is the first day of spring in the Northern Hemisphere. The sun is directly overhead at the equator.
The Moon, Earth, and Sun are very far apart from each other. But, the Moon is closer than the sun. To make sense of there distances we can use models. Models help scientist to study things that are to big, or impossible to see all the time. The Earth revolves around the sun in an elliptical orbit. The Moon revolves around the Earth in a elliptical orbit, just like the Earth revolves around the Sun in an elliptical orbit.
Make sure students you take your time, and do your best. I know you will do great, if you payed close attention. This is worth a huge part of your grade, the activity. Remember to do your best. Feel free do refer back to the other slides or ask questions.
Activity for lesson-
Students for this activity, you will answer these questions.
What season do you get since the earth is on a tilt and moves on its orbit?
What is the summer solstice?
Which one do scientist like better when the moon is at apogee or perigee. Why?
How many hours does it take for the Earth to spin one whole circle?
During the winter in the Norther Hemisphere, are days shorter or longer? Why?
Why do scientist use models?
The activity I chose for my students was to answer some question based on the lesson we went over. I covered everything for the activity. So, every student should do fabulous on it. The students must finish there activity today.
The students did terrific. Everybody got a 100% on the activity. I feel really good. I chose the activity because I want to see if the students paid attention. Well, they really paid attention based on the activity results. All the answers are in the presentation.