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The little Circle in the middle represents thePlanet Jupiter , the four concentrick Circles the proper Orbits of his fourSatellits , duly proportioned to the breadth of his body; the distances betwixt theparallel lines intersecting them, being each equall to one of his Semidiameters.

philosophical transactions of the royal society of london

An abstract of a letter from Mr. J. Flamsteed. Math. Reg. & F. of the R. S. giving the description & uses of an instrument for finding the distances of 4 s satellits from his axis, with the help of the table of parallaxes and catalogue of ecliples; printed in the preceding transactions