英语词汇“standard candle”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

standard candle n. (a) a former unit of luminous intensity, defined as the intensity of the flame of a spermaceti candle of specified properties (see quot. 1937); (also) a candle having these properties (now historical); (b) Astronomy an astrophysical object of known absolute magnitude whose distance from the observer can then be determined using its apparent magnitude.The standard candle has been replaced as a unit of luminous intensity by the candela.

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the world > matter > light > illumination > [noun] > unit of illumination > standard candle

standard candle1850

candle1866

candle power1877

the world > matter > physics > electromagnetic radiation > light > intensity of light, luminosity > [noun] > unit of light intensity > superseded terms

standard candle1850

phot1894

photon1916

1850 Jrnl. Gas Lighting 11 Nov. 314/2 Five cubic feet per hour of this gas giving a light equal to from 22 to 25 standard candles.

1937 G. S. Monk Light v. 36 The standard candle was originally of sperm wax, weighing ¹/ ₆ lb., ⁷/ ₈ in. diameter, and burning 120 grains per hr.

1959 Listener 2 July 14/2 By studying the period of a Cepheid, we can..find out its real luminosity; its apparent magnitude is easy to measure, and hence its distance may be determined, so that these convenient variables act as our standard candles in space.

1976 New Scientist 2 Dec. 530/1 The new finding opens the way to calibrate a new standard candle, namely, the absolute brightness of a galaxy by means of an easy measurement in radio astronomy.

2005 J. F. Hawley & K. A. Holcomb Found. Mod. Cosmol. (ed. 2) xiii. 384 The apparent brightness of a standard candle is a proxy for distance, since in flat spatial geometry the brightness drops off as the distance squared.

2018 S. A. Treese Hist. & Measurem. Base & Derived Units xiii. 928 To determine candlepower of a light source, a standard candle was burned next to the light source of interest, separated by an opaque divider.

单词	standard candle
释义	> as lemmas standard candle standard candle n. (a) a former unit of luminous intensity, defined as the intensity of the flame of a spermaceti candle of specified properties (see quot. 1937); (also) a candle having these properties (now historical); (b) Astronomy an astrophysical object of known absolute magnitude whose distance from the observer can then be determined using its apparent magnitude.The standard candle has been replaced as a unit of luminous intensity by the candela. ΘΚΠ the world > matter > light > illumination > [noun] > unit of illumination > standard candle standard candle1850 candle1866 candle power1877 the world > matter > physics > electromagnetic radiation > light > intensity of light, luminosity > [noun] > unit of light intensity > superseded terms standard candle1850 phot1894 photon1916 1850 Jrnl. Gas Lighting 11 Nov. 314/2 Five cubic feet per hour of this gas giving a light equal to from 22 to 25 standard candles. 1937 G. S. Monk Light v. 36 The standard candle was originally of sperm wax, weighing ¹/ ₆ lb., ⁷/ ₈ in. diameter, and burning 120 grains per hr. 1959 Listener 2 July 14/2 By studying the period of a Cepheid, we can..find out its real luminosity; its apparent magnitude is easy to measure, and hence its distance may be determined, so that these convenient variables act as our standard candles in space. 1976 New Scientist 2 Dec. 530/1 The new finding opens the way to calibrate a new standard candle, namely, the absolute brightness of a galaxy by means of an easy measurement in radio astronomy. 2005 J. F. Hawley & K. A. Holcomb Found. Mod. Cosmol. (ed. 2) xiii. 384 The apparent brightness of a standard candle is a proxy for distance, since in flat spatial geometry the brightness drops off as the distance squared. 2018 S. A. Treese Hist. & Measurem. Base & Derived Units xiii. 928 To determine candlepower of a light source, a standard candle was burned next to the light source of interest, separated by an opaque divider. extracted from standardn.adj.int. < as lemmas
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