Columbia's 173-mile high orbit, however, was but the first step in Chandra's long climb to its observing altitude.
2.
And " Ho " is the true or observed altitude, that is, the altitude measured with sextant corrected for dip, refraction, parallax.
3.
In practice it is not necessary to use zenith distances, which are 90?minus altitude, as the calculations can be done using observed altitude and calculated altitude.
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