Tara

Ek tara, outer space me ek barraa waala gas ke ball hae. Ii jaada kar ke Hydrogen, thorraa Helium aur kuch aur element se banaa hae. Iske biich me gravity ke taagat etna jaada hae ki iske garmi se Hydrogen atoms duusra Hydrogen atom se mil ke Helium banae de hae. Iske nuclear fusion bolaa jaawe hae. Isme se jon energy nikle hae, uu dhire dhire nikal ke hajaro saal ke baad ghaam ke rup me dharti pe aae ke pahuche hae.

Taara ke dekhe waala itihaas


Itihaas me , taara dunia bhar ke log ke khaatir bahmulya hae. Taara, dharmik, divination rituals, mythology ke khaatir kaam me laawa gais hae. Taara ke kaam me laae ke  navigate  karaa jaae sake hae. Tarra se mausam mark karaa jaawe hae aur isse calendar bhi bane hae. 

Puraana astronomers  "fixed taara", jiske position  celestial sphere me badle nai hae, aur "wandering taara" (grah), jon fixed taara ke relative aapan  position ke badle hae din, nai to hafta me, ke biich me antar jaanat rahin.  Dher puraama astronomers biswas karat rahin ke taara heavemly sphere me fixed rahe hae believed that the stars were permanently affixed to a heavenly sphere aur ii hate nai hae. Astronomer log ii taara ke  asterisms aur constellation me group kare rahin aur iske kaam me laae ke grah aur Syraj ke position ke track karat rahin.  Suraj ke movement  background stars (and the horizon) ke aage ke kaam me laae ke calendars banaawa jaawat rahaa, jiske kaam me laae ke kheti karaa jaae hae.  Gregorian calendar, jiske abhi dunia bhar me kaam me laawa jaawe hae, ek  solar calendar hae, jon dunia ke  rotational axis relative to its local taara, Suraj ke kaam me laawe hae.

Sab se puraana taara ke chart jon kaafi accurate rahaa,  puraana Egyptian astronomy ke nayija rahaa, 1534 BC me.  Sab se puraana taara ke catalogue ke Mesopotamia ke Babylonian astronomers late 2nd millennium BC, Kassite Period () me banae rahin.
alt=Alternative text|thumb|Stars in the night sky
Greek astronomy ke pahila taara  catalogue ke Aristillus lagbhag 300 BC, me  Timocharis ke madat se banais rahaa.    Hipparchus (2nd century BC) ke taara me 1,020 taara rahaa, aur iske kaam me laae ke Ptolemy ke taara catalogue banaawa gais rahaa. Hipparchus ke sab se pahila "nawaa taara" ke paawe ke khatir credit karaa jaawe hae. Dher constellation aur taara ke naam Greek astronomy se aais hae.

References


Category:Taara vigyan