Cosmologies
The Night Sky
- star trails in the south: with telescope, at the south pole; northern star trails here, and here
- star trails with Milky Way
Geometry and Dynamics
- The Sun and planets on the celestial sphere
- four-planet sunset
- trailing planets
- Clementine lunar orbiter view of the Moon, Sun, Saturn, Mars, and Mercury.
- Sun motion
- the ecliptic plane animated
- Sun motion w.r.t celestial sphere: real-time movies of the Sun (LASCO C3 camera on SOHO)
- Planet motion
- Normal (direct) motion: SOHO/LASCO movie of Mercury conjunction
- Retrograde motion: Mars video
Scientific Models
Greek Cosmology: Geocentric
