question_answer 21)

The nearest star (Alpha Centauri) to our solar system is 4.29 light years away. How much is this distance in terms of parsec ? How much parallax would this star show when viewed from two locations of the earth six months apart in its orbit around the sun ? 

Answer:

As 1 light year 1 parsec  Distance of Alpha Centauri from the earth, S == 4.29 light years  parsec = 1.32 parsec In an orbit around the sun, the distance between the two locations of the earth six months apart, b = Diameter of the earth's orbit = 2 AU Parallax of the star,