Final answer:
Jupiter, Saturn, and Uranus align in the night sky every 60 years.
Explanation:
The three planets will have the same position in the night sky as seen from Earth when they align every 60 years.
This occurs because the least common multiple of their revolution periods (12, 30, and 84 years) is 60 years.
For example, when Jupiter completes five orbits (12 years x 5 = 60 years), Saturn will complete two orbits (30 years x 2 = 60 years), and Uranus will complete one orbit (84 years x 1 = 84 years).
Learn more about Orbital Period Alignment here:
https://brainly.com/question/36603414
