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UPSC Civil Service Exam Questions - Engineering

Q1:

A star is observed at its upper culmination when it is north of zenith. The latitude of the place of observation is 30°N and declination of the star is 50°N. The zenith distance of the star is

A 10°

B 20°

C 40°

D 80°

ANS:B - 20°

1) At upper culmination,
Zenith Distance = δ-θ = 50-30 =20.

2)At Lower Culmination.
Zenith Distance = 180-( δ+θ).