Direct (movement)

Direct (movement)

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It is said that a celestial body moves with direct or counterclockwise movement, when it travels its orbit from West to East.

All planets and asteroids that revolve around the Sun, including Earth, make a direct movement. Exceptions are some satellites and some of the comets that move from East to West, or, as they say in astronomical language, in the retrograde sense (or more rarely, time).

In some astronomical texts, direct movement is also called programmed. The terms direct and retrograde also apply to the apparent movements of the planets that, in the course of the year, can be direct (i.e. counterclockwise), stationary or retrograde.

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DiopterDispersion (optical)