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Topic 4:Motions. B

Motions of Earth, Moon & Sun, pgs. (63 - 68)

QuestionAnswer
Describe the Geocentric Model. Earth Centered. Earth motionless. All celestial objects orbit Earth in perfect circular paths. Model is WRONG!
Explain the Heliocentric Model. Sun Centered. Earth rotates and revolves about the Sun. Orbital paths are elliptical. Model is Correct!
How might we know if a model is accurate or not? If model can make future predictions accurately, it is very good.
Earth's axis is tilted how many degrees from a line perpendicular to the plane of its orbit of the Sun? 23.5 degrees.
What evidence exists to support that Earth rotates? Photographs from satellites or astronauts.
How can the Foucault Pendulum support that Earth rotates? In 12 hours, the pendulum swings along only one line, yet knocks down all pins in a 360 degree circle. Earth rotates below the pendulum and carries the pins into the path of the swinging pendulum.
Describe the Coriolis Effect. The apparent deflection of atmospheric wind and ocean currents towards the west if one is at the Equator and the thing is approaching from the poles.
About how many degrees will the Earth travel in its orbital path each day? About 1 degree. One (1) times 365 days is just a bit more than 360 degrees!
Name the frame of reference for a day, a month, and a year. Day is one Earth rotation. Month is one lunar cycle. Year is one Earth revolution about the Sun.
Local time is determined by longitude. How many degrees of longitude equal one hour? 15 degrees of longitude = one hour ; as 24 hours X 15 degrees = 360 degrees or one day.
If you travel west from a known time and lonigude, is it earlier or later? Earlier, such as calling California from New York. 3 Hrs earlier in Cali, so it is about 45 degrees of longitude away, West.
Calling Germany from New York, it is about six (6) hour ahead of us. How many degrees of longitude is central Europe away from us? 6 hrs. X 15 degrees/hr = 75 degrees of longitude, East is later!
Are meridians lines of latitude or longitude? Longitude such as the Prime Meridian.
Can you name Earth's only natural satellite? The Moon.
What is true of the periods of rotation and revolution of the Moon? The two are equal at 27.3 days. Thus, observers on Earth only see one side of the Moon at all times.
Created by: whearn
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