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In fact, the angle between the axis of the earth and the ecliptic plane is about 23.5 degrees. If you look in the next animated image, you can see that while earth moves in an orbit around the sun in the ecliptic plane, it rotates around its own axis under that angle of 23.5 degrees all the while.
During half of the year, the Earth is moving in the same direction as the sun. During the other half, it is moving in the opposite direction. When the Earth and the sun are moving in tandem, their combined velocity through the dark matter halo is faster than the Earthâs velocity when it and the sun are at odds. DAMAâs results seemed to reveal that the Earth really was moving through a dark matter halo.