enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. True anomaly - Wikipedia

    en.wikipedia.org/wiki/True_anomaly

    The true anomaly is usually denoted by the Greek letters ν or θ, or the Latin letter f, and is usually restricted to the range 0–360° (0–2π rad). The true anomaly f is one of three angular parameters (anomalies) that defines a position along an orbit, the other two being the eccentric anomaly and the mean anomaly.

  3. Lambert's problem - Wikipedia

    en.wikipedia.org/wiki/Lambert's_problem

    semi-major axis = 23001 km; eccentricity = 0.566613; true anomaly at time t 1 = −7.577° true anomaly at time t 2 = 92.423° This y-value corresponds to Figure 3. With r 1 = 10000 km; r 2 = 16000 km; α = 260° one gets the same ellipse with the opposite direction of motion, i.e. true anomaly at time t 1 = 7.577°

  4. Axial tilt - Wikipedia

    en.wikipedia.org/wiki/Axial_tilt

    The rotational axis of Earth, for example, is the imaginary line that passes through both the North Pole and South Pole, whereas the Earth's orbital axis is the line perpendicular to the imaginary plane through which the Earth moves as it revolves around the Sun; the Earth's obliquity or axial tilt is the angle between these two lines.

  5. Equation of the center - Wikipedia

    en.wikipedia.org/wiki/Equation_of_the_center

    A marker (red) shows the position of the periapsis. In two-body, Keplerian orbital mechanics, the equation of the center is the angular difference between the actual position of a body in its elliptical orbit and the position it would occupy if its motion were uniform, in a circular orbit of the same period.

  6. Mean motion - Wikipedia

    en.wikipedia.org/wiki/Mean_motion

    Mean motion is used as an approximation of the actual orbital speed in making an initial calculation of the body's position in its orbit, for instance, from a set of orbital elements. This mean position is refined by Kepler's equation to produce the true position.

  7. Orbital mechanics - Wikipedia

    en.wikipedia.org/wiki/Orbital_mechanics

    If < <, then the denominator of the equation of free orbits varies with the true anomaly , but remains positive, never becoming zero. Therefore, the relative position vector remains bounded, having its smallest magnitude at periapsis , which is given by:

  8. Position of the Sun - Wikipedia

    en.wikipedia.org/wiki/Position_of_the_Sun

    The position of the Sun in the sky is a function ... to calculate its azimuth and also its true ... The equation of time — above the axis a sundial will appear fast ...

  9. Eccentric anomaly - Wikipedia

    en.wikipedia.org/wiki/Eccentric_anomaly

    The true anomaly is the angle labeled in the figure, located at the focus of the ellipse. It is sometimes represented by f or v. The true anomaly and the eccentric anomaly are related as follows. [2] Using the formula for r above, the sine and cosine of E are found in terms of f :