schyrleus was a determined anticopernican in the foreword of its book which includes a dedication to jesus christ and ferdinand iii schyrleus boldly declared that after having meditated for a long time on the systems of ptolemy copernicus tycho brahe and other astronomers he was convinced that all of these scientists had advanced superfluous theories he dedicated the moons of jupiter to pope urban viii calling them astres urbanoctavianes he also wrote that saturn had two "companions" and that they were periodically eclipsed by the planet he deduced that they had their own independent orbits and that they illuminated saturn which needed light as it was a hundred times less lit by the sun than the earth[] he tells us that in  in cologne he saw pass in front of the sun a troop turnam of shooting stars that followed one another during a period fourteen days and that the glare of the sun was considerably weakened by it