before_revision: Once the figure for the Meridian Zenith Distance is obtained the sum or the difference is obtained between it and the declination of the object to obtain the latitude . This is the latitude where the position line crosses the  DR longitude.
after_revision: Once the value of the Meridian Zenith Distance is obtained the algebraic sum of it with the declination of the object gives the latitude of a point where the position line crosses the meridian of DR longitude.
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