An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

   Homepage   
   


A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

<< < abe geo orb pol > >>

Number of Results: 68 Search : bit
polar orbiting satellite
  ماهواره با مدار ِ قطبی   
mâhvâré bâ madâr-e qotbi

Fr.: satellite en orbite polaire   

A satellite that revolves around the Earth in an almost north-south orbit, passing close to both poles. The orbits are sun synchronous, allowing the satellite to cross the equator at the same local time each day. These satellites orbit at a height of 830-880 km and take about 100 minutes to complete a turn around the Earth.

polar; → orbit; → satellite.

prograde orbit
  مدار ِ فرارو   
madâr-e farârow

Fr.: orbite prograde   

Same as →prograde motion.

prograde motion; → orbit.

resonance orbit
  مدار ِ باز‌آوایی   
madâr-e bâzâvâyi

Fr.: orbite de résonance   

An orbit which is in → orbital resonance with another orbit.

resonance; → orbit.

retrograde orbit
  مدار ِ پسرفت   
madâr-e pasraft

Fr.: orbite rétrograde   

An orbit with an inclination between 90° and 270° such as those of some comets and small asteroids orbiting the Sun.

retrograde; → orbit.

spin-orbit coupling
  جفسری ِ اسپین-مدار، جفتش ِ ~   
jafsari-ye espin-madâr, jofteš-e ~

Fr.: couplage spin-orbite   

1) Astro.: A relationship between the orbital period of one body around another and its rotational period on its axis. The relationship results from tidal forces between the two bodies. For example, the rotation period of the Moon equals its revolution period around the Earth.
2) Quantum mechanics: The interaction between a particle's → spin angular momentum and its → orbital angular momentum.

spin; → orbit; → coupling.

stationary orbit
  مدار ِ ایست‌ور   
madâr-e istvar

Fr.: orbite stationnaire   

An orbit in which the satellite revolves about the primary at the angular rate at which the primary rotates on its axis. From the primary, the satellite thus appears to be stationary over a point on the primary.

stationary; → orbit.

synchronous orbit
  مدار ِ همگام   
madâr-e hamgâm

Fr.: orbite synchrone   

synchronous rotation.

synchronous; → orbit.

tadpole orbit
  مدار ِ وگیزی   
madâr-e vagizi

Fr.: orbite en forme de têtard   

A shorter → horseshoe orbit confined to the → Lagrangian points L4 or L5.

tadpole; → orbit.

<< < abe geo orb pol > >>