Average Sidereal Period
Planet Orbital: Speed (km/s) (years) (days)
Mercury: 47.9 0.241 87.969
Venus: 35.0 0.615 224.70
Earth: 29.79 1.000 365.256
Mars: 24.1 1.88 686.98
Jupiter: 13.1 11.86
Saturn: 9.64 29.46
Uranus: 6.83 84.10
Neptune: 5.5 164.86
Table 4 Students will scale down the orbital speed to 1 inch equals 20,000,000 km/s ratio in order to measure out the distance of the arc on their model. Students will also need Table 3. Source: Universe, Freedman, Kaufmann, seventh edition, 2005.
