Harriot, Thomas, Mss. 6788

List of thumbnails

< >
841
841 (421r) 		842
842 (421v)
843
843 (422r) 		844
844 (422v)
845
845 (423r) 		846
846 (423v)
847
847 (424r) 		848
848 (424v)
849
849 (425r) 		850
850 (425v)
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page |< < (489r) of 1134 > >|
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          <pb file="0977.jpg" o="489r" n="977"/>
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          <p>
            <s xml:space="preserve"> And this you may do without offendinge the ey, if you be wary. In the
              <lb/>
            beginning of your observation first hide the sonne with the crosse & so keep
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            him hidden with the orderly moving of your body & hand answerable to the
              <lb/>
            surge of the sea, & you bring him downe by litle & litle till you se only the
              <lb/>
            edge of the sonne; & if you see the other end of the crosse upon quick sight
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            close with the Horizon, it is well. Otherwise you must pull to or put from the
              <lb/>
            crosse untill you find that </s>
          </p>
          <p>
            <s xml:space="preserve"> The summe of all
              <emph style="st">is this</emph>
            in taking altitudes by the staffe is
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            this. ffirst take the altitude close from the Horizon & that is called
              <lb/>
            the Apparent altitude. ffrom it abate two thinges that is the parallaxis of the staffe & the
              <lb/>
            surplus of the Horizon. The remaynder is the true hight
              <lb/>
            of the </s>
          </p>
          <p>
            <s xml:space="preserve"> But if you take the higher edge of the sonne you must abate
              <lb/>
            16 minuts more &
              <emph style="super">then</emph>
            you have the true altitude desired.
              <lb/>
              <emph style="super">Examples of the premisses you shall have in the chapters of taking the altitudes of the pole.</emph>
              <lb/>
              <emph style="st">There is yet is yet the altitude</emph>
            </s>
          </p>
          <p>
            <s xml:space="preserve"> If absolute exacteness were to be required then it is yet to be addded
              <lb/>
            to the
              <emph style="super">altitude of the</emph>
            sonne two thinges, that is to say his parallaxis of altitude,
              <lb/>
            & angle of refraction caused by the
              <emph style="st">ayre</emph>
            highest superficies of
              <lb/>
            the ayre: And to the altitude of the starre only the angle of
              <lb/>
            refraction. but because in your voyadge they amount not
              <lb/>
            ether one or both
              <emph style="st">not</emph>
            to 3
              <emph style="st">[???]</emph>
              <emph style="super">when most</emph>
            , I leave them for
              <lb/>
            other place & time to be </s>
          </p>
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    </echo>
Impressum