How is a planet's orbital period determined?
Orbital period is the time taken by an object - such as a planet - to complete one orbit around the central star, such as a sun. The orbital period of a planet is determined by its distance from the star as well as the star's mass. The bigger the distance between a planet and its star, the longer the orbital period will be.

One way to determine a planet's orbital period is through observations. Scientists can track the motion of a planet over a period of time and determine how long it takes for it to return to the same position in its orbit. Alternatively, a planet's orbital period can also be calculated mathematically using Kepler's Third Law of Planetary Motion. This law states that the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis (average distance) of its orbit, with the constant of proportionality being the same for all planets orbiting the same star. By measuring the distance of a planet from its star and knowing the star's mass, scientists can then use this formula to calculate the planet's orbital period.
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How is a planet's orbital period determined?

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Orbital period is the time taken by an object - such as a planet - to complete one orbit around the central star, such as a sun. The orbital period of a planet is determined by its distance from the star as well as the star's mass. The bigger the distance between a planet and its star, the longer the orbital period will be.

One way to determine a planet's orbital period is through observations. Scientists can track the motion of a planet over a period of time and determine how long it takes for it to return to the same position in its orbit. Alternatively, a planet's orbital period can also be calculated mathematically using Kepler's Third Law of Planetary Motion. This law states that the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis (average distance) of its orbit, with the constant of proportionality being the same for all planets orbiting the same star. By measuring the distance of a planet from its star and knowing the star's mass, scientists can then use this formula to calculate the planet's orbital period.