How Many Years Until All Planets Align 2025. Six planets will be visible in the january night sky, but planetary alignments aren't anything special. On friday 17 january and saturday 18 january, six planets will line up in the night sky, in an event that some astronomers refer to as a planetary parade.
For the solar system, mercury is the fastest planet, with a period of about 0.241 years, so then the average time between two alignments of all 8 planets to within 1 degree of. The year 2025 will be amazing for astronomy enthusiasts, with several planetary alignments predicted.
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