Lesson 4 Flashcards
Path between two nodes in an optical network between lights through unmodified
Light Path
Path between two nodes in an optical network between lights through unmodified
Light Path
imaginary sphere with earth at center
celestial sphere
stars, planets, constellations are embedded within sphere
celestial sphere
stars, planets, constellations are embedded within sphere
celestial sphere
points in celestial sphere that lie above earth’s opposite poles
celestial poles
Point at the very top of Earth’s axis rotation ( Arctic )
Geographic True North / True North
Point at the very top of Earth’s axis rotation ( Arctic )
Geographic True North / True North
northernmost earth’s surface, 90° latitude north
GNP / True North
point on earth’s surface where the planet’s magnetic field point’s vertical downwards
Magnetic North
point on earth’s surface where the planet’s magnetic field point’s vertical upwards
Magnetic South
star that lies very close to the north celestial pole
Polaris/ Polar Star/ Northern Star
Circle around the celestial sphere midway between the celestial pole
celestial equator
Celestial Equator / CE Circle around the celestial sphere midway between the celestial poles
Celestial Equator / CE
apparent path of the sun around the celestial sphere during a year
Ecliptic / E
