The Advances in Navigation
Storyboard Text
- Long ago, people used things like: compasses, quadrants, maps, hourglasses, astrolabes, sextants, cross staff and back staff, telescopes, lead lines, and ships to navigate.
- Astrolabes were used for latitude finding.
- The compass was used to tell direction. It works by detecting the earths magnetic fields.
- A binnacle is the housing for a ships compass. Can u imagine what a binnacle looks like?
- The quadrant allows the user to determine their latitude by measuring the altitude of a heavenly body.
- Sextants were used for determining the angle between the horizon and a celestial body like the sun, moon or stars.
- Cross staff and back staff were mainly used for finding the latitude by measuring the altitude of the polar star and of the sun.
- The telescope was used to form magnified images of objects in the distance.
- Maps are used for a lot of things but to sum it up, maps present information about the world in a simple visual way.
- A wheel map is a map made in the shape of a disk with Jerusalem usually at the center.
- Ptolemy map is a map of the world know to Greco-Roman society in the 2nd century.
- Portolan charts were navigational maps designed to help sailors get safely to and from places
- Hourglasses were used to measure the time at sea and lead lines were used to measure the depth of the water and surroundings.
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