21. Check lines (or proof lines) in Chain Surveying, are essentially required
22. A negative declination shows that the magnetic meridian is to the
23. The latitude of the observer's position, is
24. If the staff is not held vertical at a level¬ling station, the reduced level calculated from the observation would be
25. At the first point of Aeries, the sun moves
26. The cross hairs in the surveying telescope are placed
27. The most convenient co-ordinate system for specifying the relative positions of heavenly bodies on the celestial sphere, is
28. The smaller horizontal angle between the true meridian and a survey line, is known
29. If $$\delta $$ is the declination of the Polaris and $$\lambda $$ is the latitude of the place, the azimuth of the Polaris, is
30. The difference in longitude of two places expressed in time is equal to the difference in their
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