Satellite communications (TV dishes, etc. ) based on this
- Satellite communications (TV dishes, etc. ) based on this
- What angle must dish point?
- at equator straight up
- at pole, horizontally
- at Rochester (Lat. = 42 deg), 42 deg from straight up towards the celestial equator (~ 20 deg for Hawaii)
- Arthur C. Clarke foresaw this important use of Space in his 1951 book The Exploration of Space
- For velocities different than the circular velocity, different orbits are achieved f. 5-8
- v = 1 km/s
- v = 7.0 km/s
- ellipse, center of earth at focus, apogee at cannon
- v = 7.8 km/s
- v = 9 km/s
- ellipse, perigee (closest) at cannon