rotational axis. Prograde or direct motion is more normal motion in the same direction as the primary rotates. However, "retrograde" and "prograde" can also...

vantage point. Direct motion or prograde motion is motion in the same direction as other bodies. While the terms direct and prograde are equivalent in this...

Prograde can refer to: Retrograde and prograde motion, in astronomy, a type of motion of astronomical bodies Metamorphism#Prograde and retrograde, in...

east to west along its ground track, in what is called "apparent retrograde" motion. This effect occurs because the satellite orbits more slowly than...

A distant retrograde orbit (DRO), as most commonly conceived, is a spacecraft orbit around a moon that is highly stable because of its interactions with...

In astronomy, Kepler's laws of planetary motion, published by Johannes Kepler in 1609 (except the third law, which was fully published in 1619), describe...

first order). A prograde or retrograde impulse (i.e. an impulse applied along the orbital motion) changes both the eccentricity and the orbital period...

the normal orbit is prograde, an orbit in the same direction as the planet rotates. Inclinations greater than 90° describe retrograde orbits (backward)...

plane of reference. The orbital inclination is 0° for prograde orbits, and π (180°) for retrograde ones.[citation needed] If the plane of reference is a...

In orbital mechanics, mean motion (represented by n) is the angular speed required for a body to complete one orbit, assuming constant speed in a circular...

than a point gravitational source, resulting in a non-closed orbit. A prograde relativistic shift happens because of relativistic effects from a massive...

to the size of the orbit). As seen from Earth, the planet's orbital prograde motion makes the Sun appear to move with respect to other stars at a rate...

is equatorial (in the same plane as the equator of Mars), circular, and prograde (rotating about Mars's axis in the same direction as the planet's surface)...

astronomers are eclipses, apparent retrograde motion/planetary stations, planetary ingresses, sidereal time, positions for the mean and true nodes of the moon, the...

discovery was made with the help of radial velocity measurements that showed retrograde apsidal precession of the brown dwarf pair, which could not be explained...

life to reduce the probability of colliding with operational spacecraft and generating space debris. A graveyard orbit is used when the change in velocity...

outer irregular satellites whose prograde and retrograde orbits are much farther from Jupiter and have high inclinations and eccentricities. The largest of...

Earth). By convention, the inclination of a Prograde orbit is specified as an angle less than 90°. Retrograde orbit: An orbit counter to the direction of...

inclination, allow rapid revisit times over low-latitude locations on Earth. Prograde equatorial LEOs also have lower delta-v launch requirements because they...

In astronomy, perturbation is the complex motion of a massive body subjected to forces other than the gravitational attraction of a single other massive...

sphere of influence. Motion in a patched-conic system is deterministic and simple to calculate, lending itself for rough mission design and "back of the envelope"...

explain the preponderance of retrograde moons around Jupiter; however, Saturn has a more even mix of retrograde/prograde moons so the reasons are more...

used reference planes and origins of longitude include: For geocentric orbits, Earth's equatorial plane as the reference plane, and the First Point of Aries...

{GMm}{r^{2}}}={\frac {\mu m}{r^{2}}}} Thus only the product of G and M is needed to predict the motion of the smaller body. Conversely, measurements of the smaller...

Jyotish Kepler's laws of planetary motion Occultation Parallax Retrograde and prograde motion Sidereal time Solstice Robin M. Green, Spherical Astronomy,...

than the sidereal day of the planet. An Earth satellite that is in (a prograde) subsynchronous orbit will appear to drift eastward as seen from the Earth's...

and celestial mechanics to rockets, satellites, and other spacecraft. The motion of these objects is usually calculated from Newton's laws of motion and...

orbit (LEO) and below a high Earth orbit (HEO) – between 2,000 and 35,786 km (1,243 and 22,236 mi) above sea level. The boundary between MEO and LEO is an...

the Sun are ellipses with the Sun at one focus, and described this in his first law of planetary motion. Later, Isaac Newton explained this as a corollary...

provide stable orbits in the lunar vicinity, such as halo orbits and distant retrograde orbits. Some halo orbits remain over particular regions of the lunar...