In 1623, our solar system’s two giant planets (Jupiter & Saturn) traveled together across the sky. Jupiter caught up to, and appeared to merge with, Saturn. This astronomical event became known as a “Great Conjunction.”
Jupiter and Saturn regularly appear to converge; about every 20 years. The event this year is notable because it’s been nearly 400 years since the planets passed this close to each other in the sky, and nearly 800 years since the alignment of Saturn and Jupiter occurred at night
The apparent conjunction of Jupiter and Saturn will be at its peak December 21st. Due to the timing of the event, it is known popularly as the Christmas Star.
Here are some tips for viewing...
Find a spot with an unobstructed view of the sky such as a field or park. Jupiter and Saturn are bright, so they can be seen even from most cities.
An hour after sunset, look to the southwestern sky. Jupiter will look like a bright star and be easily visible. Saturn will be slightly fainter and will appear slightly above and to the left of Jupiter until December 21, when Jupiter will overtake it and they will reverse positions in the sky.
The planets can be seen with the unaided eye, but you may be able to see Jupiter’s four large moons if you have binoculars or a telescope.
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