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by raxxor
530 days ago
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The special occasion is that their phase angles are all of a similar value so they are aligned next to each other. The phase angle describes the position in their respective orbit. If you imagine to look "down" upon the solar system, it would be the angle towards 12 o'clock. It is rare because the further the planets are from the sun, the longer their orbit periods are. While Earth completes the circle in just a bit above 365 days, Neptune for example takes nearly 165 years to do a round trip. So it would take some time for the slower planets to meet again in the same region in the sky. |
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