As it slows down before the Retrograde period, we call it the Pre-Retrograde period. Mercury goes Retrograde three times every year. This slowing down process results in the virtual phenomenon that we on our observation from earth call Retrograde. At aphelion, half a Mercury year later, it has slowed to 38.7 km/s. At perihelion Mercury’s orbital speed is 56.6 km/s. So, at perihelion (when it is closer to the Sun) a planet is moving faster than at aphelion (when is farther from the Sun). The closer a planet is to the Sun, the faster it travels along its orbit. Astronomers refer to the point of the orbit where the distance is a maximum as the aphelion, and the point where the distance is a minimum as the perihelion. RETROGRADE MERCURY IN WATER SIGN SPEED OF MERCURYĮach planet orbits the Sun on an elliptical path, so that its distance from the Sun varies regularly from maximum to minimum and back again with each round trip.
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