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Unit 5, Topic 1

Unit 5, Topic 1. For Our Eyes Only. F rame of Reference. A frame of reference is a set of axes of any kind that is used to describe the positions or motions of things. Latitude and longitude Map coordinates. Basic Grade 6 Review – do not copy.

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Unit 5, Topic 1

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  1. Unit 5, Topic 1 For Our Eyes Only

  2. Frame of Reference • A frame of reference is a set of axes of any kind that is used to describe the positions or motions of things. • Latitude and longitude • Map coordinates

  3. Basic Grade 6 Review – do not copy • Celestial bodies , Constellations, planets • On each successive day, a given star rises and sets four minutes earlier than the day before.

  4. Sky Co-ordinates • Azimuth - the first angle is measured clockwise from north. • Altitude - measure the celestial body’s angle above the horizon in degrees. • These are the altitude-azimuth co-ordinates.

  5. Sky Co-ordinates • An astrolabe is a device used to measure the altitude of an object. • A compass is used to measure an object’s azimuth.

  6. 1. Look directly to the left (west). Max height is 90° - which star is about halfway up the sky?  A

  7. Astrolabe

  8. The Earth-Centred Model • Ancient peoples still believed that the stars circle around Earth. • This led to an Earth-centredor geocentric model of the universe.

  9. Ptolemy’s Model • Ptolemy changed Aristotle’s Earth-centredmodel. He added the idea of epicycles in an attempt to make Aristotle’s model work.

  10. The Sun-Centred Model • Nicholas Copernicus proposed a sun-centered view. • He thought that the Sun was the centre of our solar system and all planets went around the sun.

  11. The Sun-Centred Model • Galileo confirmed Copernicus’ model. • He made improvements to the telescope and was able to show that Copernicus was correct. • Brain Pop Galileo Galilei

  12. The Sun-Centred Model • This is known as the Sun-centredor heliocentric model of the universe.

  13. Moon is 140° from north. That is the azimuth. • Moon is 30° from the horizon – that is the altitude.

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