The system of Tycho Brahe,[621] with some alteration and addition, has been revived and contended for in our own day by a Dane, W. Zytphen,[622] who has published _The Motion of the Sun in the Universe_, (second edition) Copenhagen, 1865, 8vo, and _Le Mouvement Sideral_, 1865, 8vo. I make an extract.
"How can one explain Copernically that the velocity of the Moon must be added to the velocity of the Earth on the one place in the Earth's orbit, to learn how far the Moon has advanced from one fixed star to another; but in another place in the orbit these velocities must be subtracted (the movements taking place in opposite directions) to attain the same result? In the Copernican and other systems, it is well known that the Moon, abstracting from the insignificant excentricity of the orbit, always in twenty-four hours performs an equally long distance. Why has Copernicus never been denominated Fundamentus or Fundator? Because he has never convinced anybody so thoroughly that this otherwise so natural epithet has occurred to the mind."
Really the second question is more effective against Newton than against Copernicus; for it upsets gravity: the first is of great depth.
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