After specifying inclination, an infinite number of orbital planes are possible. The line of nodes occurs in two places. Because the Earth spins, conventional latitude and longitude points are not used to separate where the lines of node occur. Right ascension of ascending node is an angle, measured at the center of the Earth, from the vernal equinox to the ascending node. ROM Read Only Memory.
Rotation determines day and night, and the length of the day.
Compare with revolution. Click here to return to Introduction page.