For a star that lies in the plane of Earth's orbit around the Sun,how does the observed wavelength of a hydrogen absorption line in its spectrum change in wavelength (if at all)with the time of year?

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The Answer of For a star that lies in the plane of Earth's orbit around the Sun,how does the observed wavelength of a hydrogen absorption line in its spectrum change in wavelength (if at all)with the time of year?

For a Star That Lies in the Plane of Earth's