An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 6 Search : heliocentric
heliocentric
  هورمرکزی، خورشیدمرکزی   
hurmarkazi (#), xoršid markazi (#)

Fr.: héliocentrique   

Having or representing the Sun as a center. → heliocentric cosmology, → heliocentric gravitational constant, → heliocentric Julian Day, → heliocentric parallax, → heliocentric system.

helio- + → center + → -ic.

heliocentric cosmology
  کیهان‌شناسی ِ هورمرکزی   
keyhânšenâsi-ye hurmarkazi (#)

Fr.: cosmologie héliocentrique   

A model of the Universe in which the Sun was centrally located.

heliocentric; → cosmology.

heliocentric gravitational constant
  پایای ِ گرانشی هورمرکزی   
pâyâ-ye gerâneši-ye hur-markazi

Fr.: constante gravitationnelle héliocentrique   

A parameter representing the product of the → gravitational constant by the → solar mass. It is 13.27 x 1019 m3 s-2.

heliocentric; → gravitational; → constant.

Heliocentric Julian Date
  گاهداد ِ ژولی‌ین ِ هورمرکزی   
gâhdâd-e žulian-e hurmarkazi

Fr.: date julienne héliocentrique   

The → Julian Date referenced to the center of the → Sun. Since the Earth revolves around the Sun, and since light travels at a finite speed, observations of a given object taken at different positions in the Earth's orbit are not equivalent, and so a correction for Earth's orbit around the Sun is required. Left uncorrected, the time of an observational event measured by Earth clocks will vary by 16.6 minute over the course of a year. If not properly accounted for, this can lead to a spurious signal in a → periodogram.

heliocentric; → Julian Date.

heliocentric parallax
  دیدگشت ِ هورمرکزی   
didgašt-e hurmarkazi

Fr.: parallaxe héliocentrique   

The parallax of a celestial body when viewed from two points in the Earth's orbit around the Sun. More specifically, the angular difference in a celestial object's position as seen from the center of the Sun and the center of the Earth. Also called → annual parallax.

heliocentric; → parallax.

heliocentric system
  راژمان ِ هورمرکزی   
râžmân-e hurmarkazi

Fr.: système héliocentrique   

A system in which the Sun is assumed to lie at its central point while the Earth and other bodies revolve around it.

heliocentric; → system.