You have accessAstronomical observation
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 4s satellits from his axis, with the help of the table of parallaxes and catalogue of ecliples; printed in the preceding transactions
Published:01 January 1685https://doi.org/10.1098/rstl.1685.0086
Abstract
The little Circle in the middle represents the Planet Jupiter, the four concentrick Circles the proper Orbits of his four Satellits, duly proportioned to the breadth of his body; the distances betwixt the parallel lines intersecting them, being each equall to one of his Semidiameters.
