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  2. Poles of astronomical bodies - Wikipedia

    en.wikipedia.org/wiki/Poles_of_astronomical_bodies

    In 2009 the responsible IAU Working Group decided to define the poles of dwarf planets, minor planets, their satellites, and comets according to the right-hand rule. [1] To avoid confusion with the "north" and "south" definitions relative to the invariable plane, the poles are called "positive" and "negative."

  3. Axial tilt - Wikipedia

    en.wikipedia.org/wiki/Axial_tilt

    The positive pole of a planet is defined by the right-hand rule: if the fingers of the right hand are curled in the direction of the rotation then the thumb points to the positive pole. The axial tilt is defined as the angle between the direction of the positive pole and the normal to the orbital plane.

  4. Astrological sign - Wikipedia

    en.wikipedia.org/wiki/Astrological_sign

    This is placement by house in the chart under examination. Accidental dignity is the planet's "ability to act". Accidental dignity is the planet's "ability to act". So we might have, for example, Moon in Cancer, dignified by rulership, is placed in the 12th house it would have little scope to express its good nature. [ 42 ]

  5. How to see 6 planets align in a rare night-sky parade in ...

    www.aol.com/where-see-6-planets-align-201701363.html

    Four planets — Venus, Saturn, Jupiter, and Mars — are bright enough to see with the naked eye this month. Uranus and Neptune are visible with a telescope. Uranus and Neptune are visible with a ...

  6. Orbital state vectors - Wikipedia

    en.wikipedia.org/wiki/Orbital_state_vectors

    Orbital position vector, orbital velocity vector, other orbital elements. In astrodynamics and celestial dynamics, the orbital state vectors (sometimes state vectors) of an orbit are Cartesian vectors of position and velocity that together with their time () uniquely determine the trajectory of the orbiting body in space.

  7. Stability of the Solar System - Wikipedia

    en.wikipedia.org/wiki/Stability_of_the_Solar_System

    The planets' orbits are chaotic over longer time scales, in such a way that the whole Solar System possesses a Lyapunov time in the range of 2~230 million years. [3] In all cases, this means that the positions of individual planets along their orbits ultimately become impossible to predict with any certainty.

  8. Proper motion - Wikipedia

    en.wikipedia.org/wiki/Proper_motion

    In this diagram the radial velocity happens to be one of the Sun and object parting, so is positive. Proper motion is the astrometric measure of the observed changes in the apparent places of stars or other celestial objects in the sky, as seen from the center of mass of the Solar System, compared to the abstract background of the more distant ...

  9. Astrological transit - Wikipedia

    en.wikipedia.org/wiki/Astrological_transit

    This occurs when a transiting planet returns to the same point in the sky that it occupied at the moment of a person's birth. What this means is that the planet has completed a whole circuit of the sky, and signifies that a new cycle in the person's life is beginning. The most significant returns are those of the outer planets Jupiter and Saturn.