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  2. Retrograde and prograde motion - Wikipedia

    en.wikipedia.org/wiki/Retrograde_and_prograde_motion

    Retrograde motion in astronomy is, in general, orbital or rotational motion of an object in the direction opposite the rotation of its primary, that is, the central object (right figure). It may also describe other motions such as precession or nutation of an object's rotational axis .

  3. Vakri grahas - Wikipedia

    en.wikipedia.org/wiki/Vakri_grahas

    However, retrograde motion of a planet is merely an illusion, the planet only appears to retrograde, actually it does not [2] and in which event if the faster planet is retrograde it can approach the slower planet from a later degree by backward motion which phenomenon is known as - "the applying aspect" in the Western astrology and the "Tajika ...

  4. Apparent retrograde motion - Wikipedia

    en.wikipedia.org/wiki/Apparent_retrograde_motion

    The retrograde motion of a hypothetical extremely distant (and nearly non-moving) planet would take place during a half-year, with the planet's apparent yearly motion being reduced to a parallax ellipse. The center of the retrograde motion occurs at the planet's opposition which is when the planet is exactly opposite the Sun.

  5. 5 planets are about to be retrograde at the same time. What ...

    www.aol.com/news/5-planets-retrograde-same-time...

    "Retrograde" is a term used to describe when a planet's orbit appears to slow. Technically, they are optical illusions, but we astrologers believe they have an effect down here on Earth.

  6. Precession - Wikipedia

    en.wikipedia.org/wiki/Precession

    A motion in which the second Euler angle changes is called nutation. In physics , there are two types of precession: torque -free and torque-induced. In astronomy, precession refers to any of several slow changes in an astronomical body's rotational or orbital parameters.

  7. A Complete Guide to Every Mercury Retrograde Happening ... - AOL

    www.aol.com/lifestyle/complete-guide-every...

    Leo rules the heart in astrology, meaning this retrograde could deal with your love life. This retrograde is also special because it begins in Virgo, the sign of its rulership, before moving into Leo.

  8. Deferent and epicycle - Wikipedia

    en.wikipedia.org/wiki/Deferent_and_epicycle

    Each night the planet appeared to lag a little behind the stars, in what is called prograde motion. Near opposition, the planet would appear to reverse and move through the night sky faster than the stars for a time in retrograde motion before reversing again and resuming prograde. Epicyclic theory, in part, sought to explain this behavior.

  9. Retrograde - Wikipedia

    en.wikipedia.org/wiki/Retrograde

    Retrograde motion, an orbit in the opposite direction of the rotation of the central mass or most other satellites; Retrograde signaling, the process where a signal travels backwards from a target source to its original source; Apparent retrograde motion, the apparent motion of planets as observed from a particular vantage point