elescope, are firmly fixed together, and made to revolveon the center of the mural circle. The circle is graduated from the zenith and nadir points,each way, to the horizon, from 0 to 90 degrees. When the telescope is directed to the horizon, the indexpoints, I and i, will be at Z and N, and, of… … How to ob-serve meri-dian alti-tudes. REFRACTION. 23 figure, the index points, / and i, will show the position of the chap. hi.telescope, or its angle from the horizon, which is the altitudeof the star. As the telescope, and index of this instrument, can revolve Mural ek.freelv round the whole…
Astronomy
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