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x O = Centre of our Galaxy
x x O - x0 = Reference line
x x O - v = Direction of Galaxy
x v x M v1 = projection of v in
v1. n . M1 plane of Galaxy
x O S S = Sun
n M = Mercury at Aphelion
x x S - M = Long axis
x x nSn = Line of node
x x M1 = projection of M in
x0 plane of Galaxy
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The Sun moves in the direction of the arrow. Speed is 250km/sec
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