Final answer:
Stellar occultations are the most accurate way to measure the size of a solar system object by observing the slight dimming of a star's brightness when the object passes in front of it.
Step-by-step explanation:
Stellar occultations are the most accurate way to measure the size of a solar system object.
During a stellar occultation, when a planet or other object passes in front of a star, astronomers can measure the slight dimming of the star's brightness. From the amount of starlight obscured, they can determine the size of the object.
For example, by carefully measuring the dips in brightness of a star caused by a planet transiting in front of it, astronomers can calculate the size of the planet.