57. The Polaris describes a small circle round the pole whose radius is approximately

A. 1'

B. 2?

C. 3e

D.40

58. If the altitudes of a star at its upper and lower transits are 60? 30' and 19? 30' respectively, the latitude of the place, is

A. 30?

B. 35?

C. 40?

D. 45?.

59. The latitude of a place was obtained by subtracting the zenith distance of a star from its declination, the observed star was between

A. horizon and equator

B. equator and zenith

C. zenith and pole

D. pole and horizon.

60. The latitude of a place was obtained by subtracting the declination of a star from its zenith distance, the observed star was between

A. horizon and equator

B. (zenith and pole

C. equator and zenith

D. pole and horizon.

61. When a star is between the pole and the horizon, the relationship between latitude (X), zenith distance (z) and declination 6, is

A. 0 = z + 8

B. 0 = 6 ? z

C. 0 = 180? - (z + 6)

D. 0 = (z + 8) - 180?.

62. The latitude (X) of a place and the altitude (a) of the pole are related by

A. X = a

B. X = 90? -

C. X = - 90?

D. X = 180? - a.

63. Polaris is usually observed for the determination of the latitude when it is

A. at culmination

B. at elongation

C. neither at culmination nor at elongation

D. either at culmination or at elongation.

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