カネチカ.net
Speed
mph
km/h
Mach (1116 ft/sec)
% speed of light
Distance
miles
kilometers
light years
dT′ = dT / √(1 − v²/c²)
Earth
twin 1
Moon
Sun
Mercury
Venus
Mars
Jupiter
Saturn
Uranus
Neptune
Pluto
Alpha Centauri
114 Tauri
Taurus
Ursa Major
Orion
Cygnus
Andromeda
twin 2
twin 1
twin 1
twin 2