"प्रकाशवर्षः" इत्यस्य संस्करणे भेदः

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'''प्रकाशवर्षः'''(संक्षिप्तरूपम् : '''प्र व''') ज्योतिर्विज्ञाने व्यवहृतः एकः मानकः(unit)। शून्यस्थले (महाकाशे) एकस्मिन् संवत्सरे प्रकाशेन अतिक्रान्तं दूरं यदस्ति तदेव प्रकाशवर्षः इति निर्दिश्यते । प्रकाशेन अतिक्रान्तं दूरं भवति प्रायः १० ट्रिलियन् कि.मी.परिमितम् (६ ट्रिलियन् मैल् )<ref group=उद्धरणम्>एकं ट्रिलियन् दूरत्वं =१०<sup>१२</sup> (एकं मिलियन् मिलियन्).</ref> ।
 
 
<!----[[Astronomical system of units#Astronomical unit of length|astronomical unit of length]] equal to just under 10 [[1000000000000 (number)|trillion]] [[kilometre]]s (or about 6 trillion [[mile]]s).<ref group=note>One trillion here is [[long and short scales|taken to be]] 10<sup>12</sup> (one million million).</ref> As defined by the [[International Astronomical Union]] (IAU), a light-year is the distance that [[Speed of light|light travels in vacuum]] in one [[Julian year (astronomy)|Julian year]].<ref name="IAUgen">{{citation| url = http://www.iau.org/public_press/themes/measuring
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==History==
 
The first successful measurement of the distance to a star other than our Sun was made by [[Friedrich Bessel]] in 1838. The star was [[61 Cygni]], and he used a {{convert|6.2|in|adj=on}} [[heliometer]] designed by [[Joseph von Fraunhofer]]. The largest unit for expressing distances across space at that time was the astronomical unit (AU), equal to the radius of the Earth's orbit {{nowrap|({{val|1.50|e=8|u=km}};}} {{nowrap|{{val|9.30|e=7|u=mi}}).}} In those terms, trigonometric calculations based on 61 Cygni's [[parallax]] of 0.314 arcseconds, showed the distance to the star to be {{convert|660000|AU|km mi}}. Bessel realised that a much larger unit of length was needed to make the vast interstellar distances comprehensible.
 
[[James Bradley]] stated in 1729 that light travelled 10,210 times faster than the Earth in its orbit. In 1769, a [[transit of Venus]] revealed the distance of the Earth from the Sun, and this, together with Bradley's figure, allowed the speed of light to be calculated as {{val|3.01|e=8|u=m/s}}, very close to the modern value.
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