Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
Text
Text Image
Image
XML
Thumbnail overview
Document information
None
Concordance
Figures
Thumbnails
List of thumbnails
<
1 - 10
11 - 20
21 - 30
31 - 40
41 - 50
51 - 60
61 - 70
71 - 80
81 - 90
91 - 100
101 - 110
111 - 120
121 - 130
131 - 140
141 - 150
151 - 160
161 - 170
171 - 180
181 - 190
191 - 200
201 - 210
211 - 220
221 - 230
231 - 240
241 - 250
251 - 260
261 - 270
271 - 280
281 - 290
291 - 300
301 - 310
311 - 320
321 - 330
331 - 340
341 - 350
351 - 360
361 - 370
371 - 380
381 - 390
391 - 400
401 - 410
411 - 420
421 - 430
431 - 440
441 - 450
451 - 460
461 - 470
471 - 480
481 - 490
491 - 500
501 - 510
511 - 520
521 - 530
531 - 540
541 - 550
551 - 560
561 - 570
571 - 580
581 - 590
591 - 600
601 - 610
611 - 620
621 - 630
631 - 640
641 - 650
651 - 660
661 - 670
671 - 680
681 - 690
691 - 700
701 - 701
>
201
202
203
204
205
206
207
208
209
210
<
1 - 10
11 - 20
21 - 30
31 - 40
41 - 50
51 - 60
61 - 70
71 - 80
81 - 90
91 - 100
101 - 110
111 - 120
121 - 130
131 - 140
141 - 150
151 - 160
161 - 170
171 - 180
181 - 190
191 - 200
201 - 210
211 - 220
221 - 230
231 - 240
241 - 250
251 - 260
261 - 270
271 - 280
281 - 290
291 - 300
301 - 310
311 - 320
321 - 330
331 - 340
341 - 350
351 - 360
361 - 370
371 - 380
381 - 390
391 - 400
401 - 410
411 - 420
421 - 430
431 - 440
441 - 450
451 - 460
461 - 470
471 - 480
481 - 490
491 - 500
501 - 510
511 - 520
521 - 530
531 - 540
541 - 550
551 - 560
561 - 570
571 - 580
581 - 590
591 - 600
601 - 610
611 - 620
621 - 630
631 - 640
641 - 650
651 - 660
661 - 670
671 - 680
681 - 690
691 - 700
701 - 701
>
page
|<
<
of 701
>
>|
<
archimedes
>
<
text
>
<
body
>
<
chap
>
<
p
type
="
main
">
<
s
>
<
pb
xlink:href
="
040/01/310.jpg
"
pagenum
="
290
"/>
more than truth, when it is before hand 23. or 24. Degrees high,
<
lb
/>
would be the leſſening its
<
emph
type
="
italics
"/>
Parallax
<
emph.end
type
="
italics
"/>
about 3. minutes, the which
<
lb
/>
abatement is too ſmall to pull down the Star below the Moon, and
<
lb
/>
in ſome caſes is leſſe than the advantage given him by us in
<
lb
/>
ting that the exceſſe of the inferiour diſtance from the Pole above
<
lb
/>
the Superiour, is all
<
emph
type
="
italics
"/>
Parallax,
<
emph.end
type
="
italics
"/>
the which advantage is far more clear
<
lb
/>
and palpable than the effect of Refracton, of the greatneſſe of
<
lb
/>
which I ſtand in doubt, and not without reaſon. </
s
>
<
s
>But beſides, I
<
lb
/>
demand of the Author, whether he thinks that thoſe Aſtronomers,
<
lb
/>
of whoſe obſervations he maketh uſe, had knowledge of theſe
<
lb
/>
fects of Refractions, and conſidered the ſame, or no; if they did
<
lb
/>
know and conſider them, it is reaſonable to think that the, kept
<
lb
/>
count of them in aſſigning the true Elevation of the Star, making
<
lb
/>
in thoſe degrees of Altitude diſcovered with the Inſtruments, ſuch
<
lb
/>
abatements as were convenient on the account of the alterations
<
lb
/>
made by the Refractions; inſomuch that the diſtances by them
<
lb
/>
livered, were in the end thoſe corrected and exact, and not the
<
lb
/>
parent and falſe ones. </
s
>
<
s
>But if he think that thoſe Authors made
<
lb
/>
no reflection upon the ſaid Refractions, it muſt be confeſſed, that
<
lb
/>
they had in like manner erred in determining all thoſe things which
<
lb
/>
cannot be perfectly adjuſted without allowance for the
<
lb
/>
ons; amongſt which things one is the preciſe inveſtigation of the
<
lb
/>
Polar Altitudes, which are commonly taken from the two
<
lb
/>
an Altitudes of ſome of the fixed Stars that are conſtantly viſible,
<
lb
/>
which Altitudes will come to be altered by Refraction in the ſame
<
lb
/>
manner, juſt as thoſe of the new Star; ſo that the Polar Altitude
<
lb
/>
that is deduced from them, will prove to be defective, and to
<
lb
/>
take of the ſelf ſame want which this Author aſſigns to the
<
lb
/>
tudes aſcribed to the new Star, to wit, both that and theſe will
<
lb
/>
be with equal falſhood placed higher than really they are. </
s
>
<
s
>But any
<
lb
/>
ſuch errour, as far as concerns our preſent buſineſſe, doth no
<
lb
/>
judce at all: For we not needing to know any more, but onely
<
lb
/>
the difference between the two diſtances of the new Star from the
<
lb
/>
Pole at ſuch time as it was inferiour and ſuperiour, it is evident that
<
lb
/>
ſuch diſtances would be the ſame, taking the alteration of
<
lb
/>
ction commonly for the Star and for the Pole, or for them when
<
lb
/>
commonly amended. </
s
>
<
s
>The Authors Argument would indeed have
<
lb
/>
had ſome ſtrength, though very ſmall, if he had aſſured us that
<
lb
/>
the Altitude of the Pole had been once preciſely aſſigned, and
<
lb
/>
rected from the errour depending on refraction, from which
<
lb
/>
gain the Aſtronomers had not kept themſelves in aſſigning the
<
lb
/>
titudes of the new Star; but he hath not aſcertained us of that,
<
lb
/>
nor perhaps could he have done, nor haply, (and this is more
<
lb
/>
bable) was that caution wanting in the Obſervators.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SAGR. </
s
>
<
s
>This argument is in my judgment ſufficiently </
s
>
</
p
>
</
chap
>
</
body
>
</
text
>
</
archimedes
>