Fr.: plan équatorial
The plane containing a celestial object's equator.
Fr.: rayon équatorial
Of a planet, the distance from the center to the equator. For Earth it is 6,378.1370 km. Jupiter has an equatorial radius 11.2 times Earth's value.
Fr.: vent équatorial
A slow, dense → stellar wind (high → mass loss rate) emanating from equatorial regions of a → B[e] star. The equatorial and → polar winds are the two main wind components in B[e] stars. The mechanism suggested to explain this wind morphology is the rotationally induced → bistability mechanism.
M.E., from L. aequi-, combining form representing aequus, → equal.
Hamug-, → equal.
Math.: having three axes of the same length. Also equiaxed.
sebar-e sé-pahlu-barâbar (#)
Fr.: triangle équilatéral
A triangle having three equal sides.
From L. æquilibrium, from æquus, → equal + libra "a balance, scale."
Tarâzmandi, noun of tarâzmand "in equilibrium," from tarâz "level; a level" + possession suffix -mand. The first component from tarâzu "balance, scales," Mid.Pers. tarâzên-, taraênidan "to weigh;" Proto-Iranian *tarāz-, from *tarā- "balance, scale" (cf. Skt. tulā- "scales, balance, weight," from tul- "to weigh, make equal in weight, equal," tolayati "weighs, balances;" L. tollere "to raise;" Gk. talanton "balance, weight," Atlas "the Bearer" of Heaven;" Lith. tiltas "bridge;" PIE base telə- "to lift, weigh") + Av. az- "to convey, conduct, drive," azaiti drives" (cf. Skt. aj- "to dive, sling," ájati "drives," ajirá- "agile, quick;" Gk. agein "to lead, guide, drive, carry off;" L. agere "to do, set in motion, drive," from PIE root *ag- "to drive, move," → act).
Fr.: équilibre de partition
A concept whereby chemical → concentrations among geological or environmental media are at equilibrium, and therefore the partitioning of metals in those media can be predicted based on → partition ratios.
naheš-e tarâzmandi (#)
Fr.: position d'équilibre
The position of an oscillating body at which no net force acts on it.
estât-e tarâzmandi, hâlat-e ~
Fr.: état d'équilibre
Of or relating to an equinox or to the equality of day and night.
Adjective of → equinox.
Fr.: colure d'équinoxe
The great circle of the celestial sphere through the celestial poles and equinoxes; the hour circle of the vernal equinox. → colure.
Fr.: points équinoxiaux
One of the two points of intersection of the ecliptic and the celestial equator. Same as equinox.
1) One of the two points on the → celestial sphere
where the → celestial equator intersects the
→ ecliptic, that is when the apparent
→ ecliptic longitude of the Sun is 0° or 180°.
M.E., from O.Fr. équinoxe, from M.L. equinoxium "equality of night (and day)," from L. æquinoctium, from æquus, "→ equal" + nox "→ night" (gen. noctis). In Gk. isimeria "equal day," from isos "equal," → iso-, + hemera "day."
From hamug, → equal, + -ân suffix denoting time and place.
equipartition of energy
Fr.: équipartition de l'énergie
1) General: Equal sharing of the → total energy among all
→ components of a → system.
Fr.: surface équipotentielle
An imaginary surface surrounding a body, or group of bodies, over which the gravitational field is of constant strength and, at all points, is directed perpendicular to the surface. For a single star the surface is spherical. In a close binary system the equipotential surface of the components interact to become hourglass-shaped. → Roche lobe; → Lagrangian points.
The state or fact of being equivalent; equality in value, force, significance, etc. → covalence.
From M.F. from M.L. æquivalentia, from L. æquivalent-, → equivalent.
Hamug-arzi, noun of hamug-arz, → equivalent.
Fr.: principe d'équivalence
A fundamental concept of physics, put forward by A. Einstein, that states that gravitational and inertial forces are of a similar nature and indistinguishable. In other words, acceleration due to gravity is equivalent to acceleration due to other forces, and gravitational mass is the same as inertial mass. Same as the → principle of equivalence.
Equal in value, measure, force, effect, significance, etc.
From L.L. æquivalentem (nominative æquivalens) "equivalent," p.p. of æquivalere "be equivalent," from L. æquus, → equal + valere "to be worth; be strong."
Hamug-arz, from hamug-, → equi-, + arz stem of arzidan "to be worth," arzân "worthy; of small value, cheap," arj "esteem, honour, price, worth;" Mid.Pers. arz "value, worth," arzidan "be worth," arzân "valuable;" Av. arəjaiti "is worth," arəja- "valuable," arəg- "to be worth;" cf. Skt. arh- "to be worth, to earn," árhant- "worthy person;" Gk. alphanein "to bring in as profit," alphein "to ear, obtain;" Lith. algà "salary, pay;" PIE base *algwh- "to earn; price, value."
Fr.: profondeur équivalente
A measure of the number of particles passing a given point in a → planetary ring per unit time. It is obtained by multiplying the physical width of the ring by its average → optical depth. For the variable-width eccentric rings of → Uranus, equivalent depth remains almost constant around a given ring (Ellis et al., 2007, Planetary Ring Systems, Springer).