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displacement, which would be noticed, in case we approached nearer to
our centre; for this could only show itself within our solar vortex,
outside of which there is no possibility of any indications nor of any
parallax with the sun showing itself, unless one should appear which
could not be distinguished before. The greatest matter of surprise is,
that such a leap should have been made within one or two years, when
yet no comet has hurled itself into our larger vortex,’ nor has any other
planet, so far as I know, approached so near to our terrestrial vortex,
that it could have forced us inwards. In case there have been some
such violent cause, we may presume that our planet will again recede
to its proper distance, inasmuch as this always adapts itself to the speed
and to the right track. It does not seem reasonable that this should
have taken place in a natural manner in so short a time, unless it is
deduced from observations made for some 100 years. I am glad,
how-ever, that I treated publicly a similar subject about a year ago in my
treatise »On the Earth’s Motion and Rest», in which I maintain that
the earth moves more and more slowly both iu its anuual and diurnal
revolution, from which it must necessarily follow, that it approaches nearer
and nearer to our sun; for the more rapid the motion and revolution of
the planets within the solar vortex, the greater is the distance to which
they are carried from the centre; but the slower the motion, the more
tliey are drawn inwards; moreover, it is known in what proportion the
centrifugal force increases according to the velocity with which a body
either tends outwards or inwards. Isaac Newton’s »Principia» treats of
this subject. The case with the planets is, also, as if a long arm were
made, with a ball upon it, which was free, and could slide either
forward or backward on the arm, and thus could move either out or in
by the least force; if, now, this ball should be spun round very rapidly
— especially under water — then the centrifugal force would be
increased to such a degree, that the ball would run far out on the
arm, away from its centre; but if the motion (primum mobile) should
decrease, the ball would be drawn inward. Exactly so it is with the
planets; if the first moving cause (primum mobile) decreases, the planet
approaches nearer to its centre; but if the motion is increased, the plan*
et is thrown far out; or what is the same thing, the slower the
revolution the nearer its approach to the sun, which is the theory I discuss
in the above-named treatise, which I shall show you when there is a
good opportunitv. That this, however, should take place within two or
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