Use in astronomy Light-second

-


the yellow shell indicating 1 light-day distance sun compares in size positions of voyager 1 , pioneer 10 (red , green arrows respectively). larger heliosphere s termination shock (blue shell) smaller comet hale-bopp s orbit (faint orange ellipse below). click on image larger view , links other scales.



the faint yellow sphere centred on sun has radius of 1 light-minute. comparison, sizes of rigel (the blue star in top left) , aldebaran (the red star in top right) shown scale. large yellow ellipse represents mercury s orbit.


the light-second convenient unit measuring distances in inner solar system, because corresponds closely radiometric data used determine them (the match not exact earth-based observer because of small correction effects of relativity). value of astronomical unit (roughly distance earth sun) in light seconds fundamental measurement calculation of modern ephemerides (tables of planetary positions): quoted light-time unit distance in tables of astronomical constants, , accepted value 499.004786385(20) s.



the mean diameter of earth 0.0425 light-seconds.
the average distance earth moon 1.282 light-seconds.
the diameter of sun 4.643 light-seconds.
the average distance earth sun 499.0 light-seconds.

multiples of light-second can defined, although apart light-year more used in popular science publications in research works. example, light-minute 60 light-seconds , average distance earth sun 8.317 light-minutes.









Comments

Post a Comment

Popular posts from this blog

Ice Age List of Ice Age characters

-
1 ice age 1.1 roshan 1.2 soto 1.2.1 zeke 1.2.2 oscar 1.2.3 lenny 1.3 runar 1.4 nadia 1.5 dodo birds 1.5.1 dab 1.6 carl , frank 1.7 jennifer , rachel 1.8 sylvia ice age roshan roshan, or pinky , baby manny, sid, , diego returned father. roshan young son of human tribe chief. while sleeping 1 morning, tribe attacked pack of smilodons. leader of pack, soto, wants kill roshan revenge roshan s father runar killing half pack , using skin clothes , flesh food. mother, nadia, able fend off diego, mission retrieve him. however, cornered on waterfall and, in desperate attempt save son, leaps on waterfall, holding roshan tightly in arms. both found manny , sid @ riverside. using little strength has left, gives roshan manny , sid in hopes safe them. roshan s primary care-provider sid, member of group has concern him, manny being disillusioned care , diego secretly planning kill him. manny, scarred previous experience humans, reluctant have baby, bonds him. @ end of movie, roshan reunited tribe. r...
Read more

Beiyang clique in power .281911.E2.80.9315.29 Beiyang Army

-
yuan shikai emperor of china (1915–1916). during period 1911–15, yuan shikai remained man hold beiyang army together. , followers resisted attempt kuomintang (kmt) insert outsiders chain of command. negotiated £25-million (sterling) loan five-power banking consortium support beiyang army, despite uproar kmt. in 1913 yuan shikai appointed 4 of loyal lieutenants military governors in southern provinces: duan qirui in anhui, feng guozhang in jiangsu, li shun in jiangxi , tang xiangming in hunan. unified beiyang military clique attained maximum extent of territorial control. exercised firm control on north china , yangtze river provinces. throughout 1914 supported yuan in making revisions constitution give himself treaty- , war-making powers substantial emergency powers (the 3 commanders nicknamed newspapers of time angel, tiger , dog. angel duan qirui, tiger wang shizhen , dog feng guozhang). in december 1915 yuan shikai declared himself emperor. opposed generals , officers of beiyang arm...
Read more

R172 .282011.E2.80.93Present.29 Mercedes-Benz SLK-Class

-
mercedes-benz slk 200 blueefficiency (europe) development on r172 began in 2005, final design being selected in 2008. mercedes-benz announced new slk in autumn of 2010, allowing car magazines drive disguised test cars several months prior official announcement in january 2011 , formal public launch @ geneva motor show in march 2011. company took unusual step of issuing several press releases in october , november 2010 announcing new features such magic sky control . r172 range slk 200 (2011-2015) – 1.8 l (1796 cc) 135 kw (184 ps; 181 hp) i4 turbocharged engine, 0–100 km/h (62 mph) 7.1 seconds, top speed of 149 mph. (not available in canada , united states) slk 200 (2.0) (2015–present) – 2.0 l (1998 cc) 135 kw (184 ps; 181 hp) i4 turbocharged engine, 0–100 km/h (62 mph) 6.8 seconds, top speed of 149 mph. (not available in canada , united states) slk 250 (2011-2015) – 1.8 l (1796 cc) 150 kw (204 ps; 201...
Read more