direct motion


Also found in: Wikipedia.
Direct and retrograde motion of superior planetclick for a larger image
Direct and retrograde motion of superior planet

direct motion

(prograde motion)
1. The apparent west to east motion of a planet or other object as seen from Earth against the background of stars. Retrograde motion is an apparent motion from east to west. When a superior planet near opposition is overtaken by the Earth, moving with higher relative velocity, its normal direct motion seems to become temporarily retrograde and it appears to undergo a loop or zigzag in the sky (see illustration); the turning points between these motions, when the planet appears motionless in the sky, are known as stationary points.
2. The anticlockwise orbital motion, as seen from the north pole of the ecliptic, of a planet or comet around the Sun or of a satellite around its primary. The body is then said to move in a direct orbit or prograde orbit. A clockwise orbital motion is retrograde. All the planets move in direct orbits.
3. The anticlockwise rotation of a planet, as seen from its north pole. Venus, Uranus, and Pluto have a clockwise retrograde rotation.

direct motion

[də¦rekt ′mō·shən]
(astronomy)
Eastward, or counterclockwise, motion of a planet or other object as seen from the North Pole (motion in the direction of increasing right ascension).
References in periodicals archive ?
From the 16th, Neptune's direct motion reminds you of things you said you would do.
This means it can pick up on impulses in the brain that direct motion, heart function, bladder control and other bodily functions.
It begins the period in Gemini (in the company of Mercury and Jupiter) although its direct motion carries it into neighbouring Cancer before the month's end, finding itself amongst the stars of M44, the Beehive cluster, on September 9.
The brain has some cushioning against direct motion, but can bounce back, thus damage may occur both at the impact point and on the opposite side of the brain.
direct motion, Asia and russia continued winning the Greek positive.
The direct motion of Mercury helps you clear the air about popular misconceptions about yourself, your lifestyle and your relationships, and you'll feel you can finally move on.
Superposition of the 1st longitudinal mode and the nearest flexural mode is used to obtain elliptical trajectory of contact point and to achieve direct motion of the slider.
The new press uses an innovative, electronically controlled gearless system that replaces gears with direct motion transmission to the printing cylinder, anilox and central drum--featuring A/C motors with independently adjusted digital drives.
The molecular interactions that regulate chemical catalysis and direct motion merge seamlessly with those involved in the transmission of information.
Cognex machine vision systems are already being used together with Mitsubishi factory automation products to help guide robots, to direct motion control systems and to automate a wide range of manufacturing processes," said Dr.
For more call 09050 700 439 77p per minute Libra Sept 23 - Oct 23 Mercury will tomorrow move will tomorrow move into direct motion, ending all this into direct motion, ending all this silliness with communication and silliness with communication and travel, but today he's particularly travel, but today he's particularly naughty so leave a bit earlier.

Full browser ?