Spectroscopic parallax is the process of finding the distance to a star by measuring its shift against the background stars over 6 months.

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Spectroscopic parallax is a method of estimating the distance to a star by analyzing its spectrum, not by observing its apparent shift over 6 months. This method works by comparing the observed brightness and temperature of the star to those of known, nearby stars with similar properties. By assuming that two stars with the same intrinsic brightness should have the same apparent brightness, astronomers can estimate the distance to the star based on how much its brightness is dimmed by its relative distance from Earth.

Spectroscopic Parallax Is the Process of Finding the Distance to a Star