Angular speed:   x10−5 rad/s
Initial position:  °,   ° (lat, lon)
Initial velocity:  m/s,   m/s (north, east)
Simulation speed (↑↓):  
Frame (f): Inertial
Path (p): Match frame
Path drawing (P): Efficient
Time:  hr
Earth's rotation: °
theta (lat): °
phi (lon): °
theta_dot: x10−5 rad/sec
phi_dot: x10−5 rad/sec
Relative speed: m/s
Absolute speed: m/s
Rel. kinetic energy:
Abs. kinetic energy:
Abs. ang. momentum:


1. B. Edwards and J. Edwards, "Forces and conservation laws for motion on our spheroidal Earth," Am. J. Phys. 89, 830-842 (2021). <link>
2. B. Edwards and J. Edwards, "Geodetic model for teaching motion on the Earth’s spheroidal surface," Eur. J. Phys. 43, 1015003 (2022). <link>
3. B. Edwards, C. Pankey, and J. Edwards, "Inertial motion on the Earth's spheroidal surface," Chaos, 32, 113122 (2022). <link>