If the distance of the object from the Earth is known, the angular speed of the object can be measured, and we can naively calculate the speed via:Īpparent speed = distance to object ×, the only velocity on the sky that we can measure, is larger than the velocity of light in vacuum, i.e. In tracking the movement of such objects across the sky, we can make a naive calculation of their speed by a simple distance divided by time calculation. Superluminal motion occurs as a special case of a more general phenomenon arising from the difference between the apparent speed of distant objects moving across the sky and their actual speed as measured at the source.
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