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If a straight line through the origin bi...

If a straight line through the origin bisects the line passing through the given points A `(acosalpha,asinalpha)` and B `(acosbeta,asinbeta),` then the lines are

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Vyadh or Sirius
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  12. Explain the following terms : Nadir

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  13. Explain the following terms : Celestial poles

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  14. Explain the following terms : Meridian

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  15. Explain the following terms : Celestial equator

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  16. Explain the following terms : Ecliptic

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