No need to apologize. You might have been thinking of parallax due to earth location changing as it orbits the sun, which causes very small shifts in the appar

No need to apologize. You might have been thinking of parallax due to earth location changing as it orbits the sun, which causes very small shifts in the apparent angular positions of stars. Closer stars shift more, which allows it to be used as a distance measurement to stars, but the effect is too small to measure for far away galaxies. https://en.wikipedia.org/wiki/Parallax_in_astronomy https://en.wikipedia.org/wiki/Parallax_in_astronomy