51. 23 cm × 23 cm photographs are taken from a flying height with a camera of focal length of 3600 m and 15.23 cm respectively. A parallax difference of 0.01 mm represents
52. The declination and right ascension of the sun becomes 23° 27' N and 90° respectively on
53. The declination and right ascension of the sun becomes 23° 27' S and 270° respectively on
54. The following sights are taken on a “turning point”
55. The horizontal angle between the true meridian and magnetic meridian at a place is called
56. A ’level line’ is a
57. Accidental errors
58. Pick up the correct statement from the following. The difference between the longitudes of the places is obtained.
59. Refraction correction
60. The number of horizontal cross wires in a stadia diaphragm is
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