- Atmospheric refraction
- Motions of the earth
- vertical Motions
- These are visible
Category: everyday science
- No categories
- Astrology
- Astrophysics
- Astronomy
- Geophysics
- Gravitation and centrifugal force
- Their Great Size
- The rotation and density
- Rotation of sun on its axis
- Parsec
- Light year
- Astronomical year
- Cosmic year
- Constellations
- Galaxies
- Comets
- Solar System
- Mercury
- Mars
- Jupiter
- Saturn
- Galactic unit
- Light year
- Cosmic kilometer
- None of these
- Elliptical or hyperbolical orbits, usually accompanied by a shinning tail
- Elliptical orbits usually accompanied by a long shinning tail
- hyperbolic orbits always accompanied by a shinning head
- hyperbolic orbits without projecting any tail
