y-seven degrees from it， but cyrus harding knew this and made allowance for it in his calculation. he took care also to observe the moment when it passed the meridian below the pole， which would simplify the operation.
cyrus harding pointed one leg of the compasses to the horizon， the other to alpha， and the space between the two legs gave him the angular distance which separated alpha from the horizon. in order to fix the angle obtained， he fastened with thorns the two pieces of wood on a third placed transversely， so that their separation should be properly maintained.
that done， there was only the angle to calculate by bringing back th
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