Celestial measurements refer to the techniques used to determine the positions and distances of objects in space, such as stars, planets, and galaxies. Astronomers use tools like telescopes and instruments to observe celestial bodies and gather data. By measuring angles and distances, they can create maps of the night sky and understand the universe's structure. One common method of celestial measurement is parallax, which involves observing an object from two different points in Earth's orbit. This technique helps calculate the distance to nearby stars. Another important concept is light-years, which is the distance light travels in one year, helping us grasp the vastness of space.