Celestial Navigaion - University of Minnesotahspark/CSci5980/Lec3... · Celestial Navigation Far...
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Celestial Navigaion
Transcript of Celestial Navigaion - University of Minnesotahspark/CSci5980/Lec3... · Celestial Navigation Far...
Celestial Navigaion
Where am I?
Celestial Navigation
Earth
Far far away: point at infinity
My location
Celestial Navigation
Earth
Far far away: point at infinity
My location
Celestial Navigation
Earth
Far far away: point at infinity
My location
Projection of the star
Celestial Navigation
Earth
Far far away: point at infinity
My location
Projection of the star
57 stars for navigation
Celestial Navigation
Earth
Far far away: point at infinity
Projection of the star
My location
Zenith
57 stars for navigation
Celestial Navigation
Earth
Far far away: point at infinity
Projection of the star
My location
rr
r : radius of earth
: angle between stars
Zenith
Celestial Navigation Far far away: point at infinity
My location
Horizon
Sextant
Earth
Projection of the star
Zenith
Celestial Navigation Far far away: point at infinity
My location
Horizon
Sextant
Earth
Projection of the star
Direction does not change because the star is infinitly far away.
Zenith
Celestial Navigation Far far away: point at infinity
My location
Horizon
Sextant
Earth
Projection of the star
rr
r : radius of earth
: angle between stars
Orthographic proj.
Zenith
Celestial Navigation Far far away: point at infinity
Horizon
Sextant
Earth
r : radius of earth
: angle between stars
Celestial Navigation Far far away: point at infinity
Horizon
Sextant
Earth
At least two stars are needed.
Celestial Navigation Far far away: point at infinity
Horizon
Earth
At least two stars are needed.
Two points at infinity (vanishing points) tells us about where I am.
