1 earthly rotation on axis = 24 hours @ 1675 km/h
1 earthly solar rotation = 365.25 earth days @ 108,000 km/h (30 km/s)
1 solar system rotation of milky way = 225-240 million years @ 720,000 km/h (200 km/s)
Local group (inc. milky way) relative speed of transit through space = 600 km/s
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