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2. Opposition (astronomy) - Wikipedia

   en.wikipedia.org/wiki/Opposition_(astronomy)

   Diagram of positional astronomy. In positional astronomy, two astronomical objects are said to be in opposition when they are on opposite sides of the celestial sphere, as observed from a given body (usually Earth). A planet (or asteroid or comet) is said to be "in opposition" or "at opposition" when it is in opposition to the Sun.

3. Outline of Mars - Wikipedia

   en.wikipedia.org/wiki/Outline_of_Mars

   The following outline is provided as an overview of and topical guide to Mars: Mars – fourth planet from the Sun and the second-smallest planet in the Solar System , after Mercury . Named after the Roman god of war , it is often referred to as the " Red Planet " [ 1 ] [ 2 ] because the iron oxide prevalent on its surface gives it a reddish ...

4. Orbit of Mars - Wikipedia

   en.wikipedia.org/wiki/Orbit_of_Mars

   Orbit of Mars relative to the orbits of inner Solar System planets Orbit of Mars and other Inner Solar System planets An animation to explain the (apparent) retrograde motion of Mars, using actual 2020 planet positions Mars seen through a 16-inch amateur telescope, at 2020 opposition. Mars has an orbit with a semimajor axis of 1.524 ...

5. Phase angle (astronomy) - Wikipedia

   en.wikipedia.org/wiki/Phase_angle_(astronomy)

   For Jupiter, the maximum is 11.1° and for Saturn 6°. [ 1 ] The brightness of an object is a function of the phase angle, which is generally smooth, except for the so-called opposition spike near 0°, which does not affect gas giants or bodies with pronounced atmospheres , and when the object becomes fainter as the angle approaches 180°.

6. Deferent and epicycle - Wikipedia

   en.wikipedia.org/wiki/Deferent_and_epicycle

   Saturn is surpassed by the numbers by one and a half degrees." Using modern computer programs, Gingerich discovered that, at the time of the conjunction, Saturn indeed lagged behind the tables by a degree and a half and Mars led the predictions by nearly two degrees.

7. Apparent retrograde motion - Wikipedia

   en.wikipedia.org/wiki/Apparent_retrograde_motion

   Apparent retrograde motion of Mars in 2003 as seen from Earth The term retrograde is from the Latin word retrogradus – "backward-step", the affix retro- meaning "backwards" and gradus "step". Retrograde is most commonly an adjective used to describe the path of a planet as it travels through the night sky, with respect to the zodiac , stars ...

8. List of Solar System objects - Wikipedia

   en.wikipedia.org/wiki/List_of_Solar_System_objects

   Euler diagram showing the types of bodies orbiting the Sun. The following is a list of Solar System objects by orbit, ordered by increasing distance from the Sun.Most named objects in this list have a diameter of 500 km or more.

9. Syzygy (astronomy) - Wikipedia

   en.wikipedia.org/wiki/Syzygy_(astronomy)

   The word is often used in reference to the Sun, Earth, and either the Moon or a planet, where the latter is in conjunction or opposition. Solar and lunar eclipses occur at times of syzygy, as do transits and occultations. The term is often applied when the Sun and Moon are in conjunction or in opposition . [4]