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Pers. raucah-, Av. raocah- "light, luminous; daylight," Skt. roka "brightness, light," cognate with Gk. leukos "white, clear," L. lux "light" (also lumen, luna), PIE *leuk- "light, brightness". Pers. words rowšan, raxšân "bright, clear," ruz "day," and afruxtan "to light, kindle" also belong to this family, as well as the E. light, Ger. Licht, and Fr. lumière. : masse d'air A measure of the path length traversed by starlight through Earth's atmosphere before it reaches the detector; it is taken relative to the length at the zenith.

The study of such constituent parts and their interrelationships in making up a whole (opposite of synthesis). Chemistry: The separation of a substance into its constituent elements to determine either their nature (qualitative analysis) or their proportions (quantitative analysis). Mathematics: A branch of mathematics principally involving differential and integral calculus, sequences, and series and concerned with limits and convergence. L. analysis, from Gk. analysis "a breaking up," from analyein "unloose," from ana- "up, throughout" + lysis "a loosening," from lyein "to loosen, release, untie".

Words rowšan, raxšân "bright, clear," ruz "day," and afruxtan "to light, kindle" also belong to this family, as well as the E. light, Ger. Licht, and Fr. lumière. : masse d'air A measure of the path length traversed by starlight through Earth's atmosphere before it reaches the detector; it is taken relative to the length at the zenith. Airmass, from → air + → mass. Havâtud, from havâ→ air + tud, from tudeh "a mass, heap, stack, rick". : tache de diffraction, ~ d'Airy The bright disklike image of a point source of light, such as a star, as seen in an optical system with a circular → aperture.

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