Emerson, William, 1701-1782 · London : Printed for J. Nourse · leaf 245
X.^.jo. … r Sea. III. OF THE SPHERE. 5^, 6. Horizon^ is. a circle dividing the upper from Fig.the lower hemifphere, as HO, being 90^ diitant 52.from the Zenith and Nadir. 53. 7. Vertical Circles^ are circles pafling thro the ^j.Zenith and Nadir, Z 0 N. 8. Circles of Longitude in the heavens, pafs thro*the…
Mechanical engineering
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