Galilei, Galileo Dialogues on two world systems 1661, tr. Salusbury, Thomas

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278

In the sixth operation the chord, the sines and Parallax are as
followeth, and the star is found to be about 4 semidiameters; let
us see whether it will be reduced, abating the Parallax from 8 m.
to 1 m. onely; Here is the operation, and the star raised but to
27. semidiameters or thereabout; therefore the correction of 7 m.
in 8 m. doth not suffice.

In the eighth operation the chord, the sines, and the Parallax,
as you see, are these ensuing, and hence the Authour calculates
the height of the star to be 1. semidiameter and an half, with the
Parallax of 43. min. which reduced to 1 min. yet notwithstand­
ing giveth the star lesse remote than 24. semidiameters, the corre­
ction therefore of 42. min. is not enough.