Fr.: latitude géographique
geographic north pole
qotb-e hudar-e zaminnegârik
Fr.: pôle nord géographique
→ north pole.
geographic south pole
qotb-e daštar-e zaminnegârik
Fr.: pôle sud géographique
→ south pole.
The science dealing with the areal differentiation of the Earth's surface, as shown in the character, arrangement, and interrelations over the world of such elements as climate, elevation, soil, vegetation, population, land use, industries, or states, and of the unit areas formed by the complex of these individual elements (Dictionary.com).
The form of the → Earth obtained by taking average sea level surface and extending it across the continents. In other words, the → equipotential surface ("mean sea level") of the Earth's → gravitational field. The geoid is considered to represent the true physical figure of the Earth, in contrast to the → reference ellipsoid, which is idealized geometrical figure of the Earth.
Of, pertaining to, or based on → geology. Also geological.
zamân-e zaminšenâxti (#)
Fr.: temps géologique
The long span of time from the end of the formation of Earth during which our planet underwent its major transformations.
The scientific study of the composition, structure, and physical history of the Earth.
Of or pertaining to → geomagnetism.
žirandegi-ye zamin-meqnâtisi, ~ zamin-meqnâti
Fr.: activité géomagnétique
meydân-e zamin-meqnâtisi, ~ zamin-meqnâti
Fr.: champ géomagnétique
The magnetic field that is generated within the Earth and extends out around the Earth. The intensity of the magnetic field at the Earth's surface is about 0.32 → gauss at the equator and 0.62 gauss at the north pole.
tufân-e zamin-meqnâtisi, ~ zamin-meqnâti
Fr.: orage géomagnétique
A branch of geophysics concerned with the study of the Earth's → geomagnetic field, including its origin, spatial extent, and variations in time.
Of or pertaining to geometry or to the principles of geometry.
Adj. of → geometry
Fr.: albedo géométrique
A measure of the → reflectivity of a surface, especially of the solar system bodies (planets, satellites or asteroids). It is the ratio of a body's brightness at zero → phase angle to the brightness of a perfectly diffusing disk with the same position and apparent size as the body. Geometric albedo depends on the radiation wavelength. The bolometric geometric albedo refers to reflectivity in all wavelengths. Compare with the → Bond albedo.
Fr.: horizon géométrique
miyângin-e hendesi (#)
Fr.: moyenne géométrique
The middle term in a → geometric progression. Of two terms, the geometric mean is the square root of their product. For example, the geometric mean of 4 and 9 is ± 6. For a series of n terms, it is expressed as: (a1.a2. ... .an)1/n.
Fr.: optique géométrique
A branch of physics that deals with reflection and refraction of rays of light without reference to the wave or physical nature of light.
farâyâsi-e hendesi (#)
Fr.: progression géométrique
A → sequence in which the ratio of a term to its predecessor is the same for all terms. In general, the nth term has the form ar(n-1), where n is a positive integer, and a and r are nonzero constants; r is called the ratio or common ratio. Also called → geometric sequence.
Fr.: diffusion géométrique
A type of scattering in which the wavelength (of the light or the sound) is much smaller than the size of object causing the scattering.