Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.
Sailing by Starlight: the Lost Art of Celestial Navigation<br />Andrew Thaler<br />
Do you know where you are?<br />
Finding your way home<br />
Finding your way home<br />Southern Sky<br />Northern Sky<br />
Finding your way home<br />How do you travel in a straight line?<br />Latitude hook<br />Must be calibrated to a specific ...
Determining Latitude<br />Polaris<br />tan θ = x/y<br />θ = Latitude<br />X<br />θ<br />Horizon<br />y<br />
Determining Latitude<br />Accurate to within 1 Degree<br />1 degree of latitude = 60 minutes<br />1 minute = 1 nautical mi...
Latitude is θ<br />Cross staff<br />Quadrant<br />Astrolabe<br />Octant<br />Sextant<br />
Longitude<br />The X-Prize of the millennium<br />No accurate method until 19th<br />century<br />3 puzzle pieces<br />Rot...
Relative Longitude<br />Not very accurate!<br />Find a star near the eastern or western horizon<br />Measure the altitude ...
What time is it?<br />The sky is a clock, too<br />Mariner’s Nocturnal<br />Measures the angle between Polaris and Ursa Ma...
Using the Nocturnal<br /><ul><li>An analog computer
Set the dial to the date
Sight Polaris through the center hole
Upcoming SlideShare
Loading in …5
×

of

Celestial navigation Slide 1 Celestial navigation Slide 2 Celestial navigation Slide 3 Celestial navigation Slide 4 Celestial navigation Slide 5 Celestial navigation Slide 6 Celestial navigation Slide 7 Celestial navigation Slide 8 Celestial navigation Slide 9 Celestial navigation Slide 10 Celestial navigation Slide 11 Celestial navigation Slide 12 Celestial navigation Slide 13 Celestial navigation Slide 14
Upcoming SlideShare
Navigation aids
Next
Download to read offline and view in fullscreen.

4 Likes

Share

Download to read offline

Celestial navigation

Download to read offline

Celestial navigation

  1. 1. Sailing by Starlight: the Lost Art of Celestial Navigation<br />Andrew Thaler<br />
  2. 2. Do you know where you are?<br />
  3. 3. Finding your way home<br />
  4. 4. Finding your way home<br />Southern Sky<br />Northern Sky<br />
  5. 5. Finding your way home<br />How do you travel in a straight line?<br />Latitude hook<br />Must be calibrated to a specific location<br />Polaris above the loop, head south<br />Polaris below the loop, head north<br />Kamal<br />Why does this work?<br />
  6. 6. Determining Latitude<br />Polaris<br />tan θ = x/y<br />θ = Latitude<br />X<br />θ<br />Horizon<br />y<br />
  7. 7. Determining Latitude<br />Accurate to within 1 Degree<br />1 degree of latitude = 60 minutes<br />1 minute = 1 nautical mile<br />Polaris is 430 light years away<br />2.5 X 1015 miles<br />If surveyors were as accurate as Polaris - 0.0000000002 inches<br />If Polaris was as accurate as a surveyors - 4,000,000,000 miles<br />
  8. 8. Latitude is θ<br />Cross staff<br />Quadrant<br />Astrolabe<br />Octant<br />Sextant<br />
  9. 9. Longitude<br />The X-Prize of the millennium<br />No accurate method until 19th<br />century<br />3 puzzle pieces<br />Rotation of the earth = 15o per hour<br />Time the sun peaks at prime meridian = 1200<br />Time (GMT) the sun peaks at your location<br />
  10. 10. Relative Longitude<br />Not very accurate!<br />Find a star near the eastern or western horizon<br />Measure the altitude of that star at the same time every night<br />Changes in degrees correspond to movement east or west<br />2 Caveats<br />Need to correct for latitude<br />Need to know what time it is<br />
  11. 11. What time is it?<br />The sky is a clock, too<br />Mariner’s Nocturnal<br />Measures the angle between Polaris and Ursa Major or Ursa Minor<br />
  12. 12. Using the Nocturnal<br /><ul><li>An analog computer
  13. 13. Set the dial to the date
  14. 14. Sight Polaris through the center hole
  15. 15. Rotate the arm until it lines up with the head of Ursa Major</li></li></ul><li>Astronomers and Mariners<br />None of these tools were invented for navigating<br />We know where we are on earth because we wanted to know where we are in the universe<br />
  16. 16. Questions?<br />
  • Frederico007

    Aug. 29, 2018
  • CsabaHorvth5

    Feb. 17, 2016
  • Chalengsak

    Nov. 17, 2015
  • wyte22

    Mar. 14, 2015

Views

Total views

3,136

On Slideshare

0

From embeds

0

Number of embeds

1

Actions

Downloads

94

Shares

0

Comments

0

Likes

4

×