be the Earth's globe, A its centre, L E the ascending effluvia:
Just as the orbe of the effluvia progresses with the Earth, so also does
the unmoved part of the circle at the straight line L E progress along with
the general revolution. At L and E, a heavy body, M, falls perpendicularly
toward E, taking the shortest way to the centre, nor is that right movement
of weight, or of aggregation compounded with a circular movement, but is a
simple right motion, never leaving the line L E. But when thrown with an
equal force from E toward F, and from E toward G, it completes an equal
distance on either side, even though the daily rotation of the Earth is in
process: just as twenty paces of a man mark an equal space whether toward
East or West: so the Earth's diurnal motion {230} is by no means refuted by
the illustrious Tycho Brahe, through arguments such as these.

[Illustration] The tendency toward its origin (which, in the case of the
Earth, is called by Philosophers weight) causes no resistance to the
diurnal revolution, nor does it direct the Earth, nor does it retain the
parts of the Earth in place, for in regard to the Earth's solidity they are
imponderous, nor do they incline further, but are at rest in the mass. If
there be a flaw in the mass, such as a deep cavity (say 1000 fathoms), a
homogenic portion of the Earth, or compacted terrestrial matter, descends
through that space (whether filled with water or air) toward an origin more
assured than air or water, seeking a solid globe. But the centre of the
Earth, as also the Earth as a whole, is imponderous; the separated parts
tend toward their own origin, but that tendency we call weight; the parts
united are at rest; and even if they were ponderable, they would introduce
no hindrance to the diurnal revolution. For if around the axis A B, there
be a weight at C, it is balanced from E; if at F, from G; if at H, from I.
So internally at L, they are balanced from M: the whole globe, then, having
a natural axis, is balanced in aequilibrio, and is easily set in motion by
the slighted cause, but especially because the Earth in her own place is
nowise heavy nor lacking in balance. Therefore weight neither hinders the
diurnal revolution, nor influences either the direction or continuance in
position. Wherefore it is manifest that no sufficiently strong reason has
yet been found out by Philosophers against the motion of the Earth.

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