Venus moved on an eccentric and epicycle, the same as outer planets, but the Center of the epicycle followed the mean sun. Mercury is more confusing, with a crank mechanism that brings the epicycle closer and farther in an ellipse throuout the year, there probably was an Equant too. Venus' model at least was very accurate, and I can't find Mercury's accuracy.
No. Mercury orbits the sun, not Venus. Therefore it is a planet, not a moon.
The orbits of Mercury and Venus are between the sun and the orbit of Earth. That is different from saying that Mercury and Venus are between the sun and Earth, which is often not true.
Mercury and venus.
Venus and Mercury
Two. Mercury and Venus
All the planets except Venus and Mercury have moons.
That would be Mercury. Venus also has no moons, but does not move as fast as Mercury.
Mercury's orbit is moderately eccentric, at 0.2056, while Venus's orbit is the least eccentric of any planet in the solar system, at 0.0067. Mercury's inclination is at 7º, while Venus's is at 3.39º.
Mercury and Venus do not experience eclipses because they lack moons large enough to create shadows on their surfaces during their orbits.
Closest Orbits between one another, or between themselves and the sun? Mercury & Venus - From the Sun
Saturn. This is untrue. Both Mercury and Venus have shorter orbits and therefore take less time to orbit the Sun, because they are the two planets closer to the Sun then Earth. Saturn is further from the Sun and takes much longer to orbit it.
The Inner Planets: Mercury, Venus, Earth and Mars