When can parallax be used to calculate?

Parallax can be used to calculate the distance to nearby celestial objects, such as stars, by measuring the apparent shift in position of the object against a distant background when viewed from two different points in Earth's orbit. This method is effective for objects within a few hundred light-years from Earth, as the angle of parallax becomes measurable with precision using telescopes. The parallax angle is typically expressed in arcseconds, and the distance can be calculated using the formula: distance (in parsecs) = 1 / parallax angle (in arcseconds).