science help pls pls

A star is observed from two positions of Earth in its orbit, in summer and winter. Which of these is the best method to calculate the approximate distance of the star from Earth?

measure the parallax and use it in calculations
measure the red shift of emitted light and use it in calculations
use doppler effect to calculate the shift in light traveling from star to Earth in winter
use doppler effect to calculate the shift in light traveling from star to Earth in summer

is it a pls help me

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  1. http://lcogt.net/spacebook/parallax-and-distance-measurement/

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  2. A. Measure the parallax and use it in calculations

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  3. lui bag, yeah you know its full of them racks..... DAYUUUMMMM

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  4. A

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