Keplerain elements: Orbit plane Satellite equinox Node A greenwich Inclination Q2 Right Ascension of ascending node oo Argument of perigee V True anomaly Principles of the Global Positioning System 2005-3-11(11 Keplerain elements in plane Apogee Perigee FocuS Center of Mass a semimajor axIs V True anomaly b semiminor axis E Eccentric anomaly e eccentricity M Mean anomaly Principles of the Global Positioning System 20053-11(126 Principles of the Global Positioning System 2005-3-11 11 Keplerain elements: Orbit plane Node i ω Ω ν Z θ0 Greenwich Vernal equinox Satellite perigee equator i Inclination Ω Right Ascension of ascending node ω Argument of perigee ν True anomaly Principles of the Global Positioning System 2005-3-11 12 Keplerain elements in plane a Focus Center of Mass ae Satellite Apogee Perigee b E ν r a semimajor axis b semiminor axis e eccentricity ν True anomaly E Eccentric anomaly M Mean anomaly