Astronomical measurement refers to the techniques used to determine distances, sizes, and other properties of celestial objects. This includes methods like parallax, which measures the apparent shift of a star against distant background stars as Earth orbits the Sun. Another common method is using standard candles, such as Cepheid variables, whose brightness helps estimate distances to galaxies. In addition to distance, astronomers measure the brightness and temperature of stars using photometry and spectroscopy. These measurements help classify stars and understand their life cycles. Tools like telescopes and satellites enhance these measurements, allowing scientists to explore the universe more accurately.