Advanced Surveying MCQs

A star is said to elongate

If 5 is the declination of the star and 0 is the latitude of the observer then the hour angle of the star at elongation is given by

If 6 is the declination of the star and 0 is the latitude of the observer, then the azimuth of the star at elongation is given by

The elevation of the star at elongation is obtained by

Th-e'"-- value of geo-centric parallax to be added to the observed altitude of sun is

Assertion : The stars may be assumed as fixed positions on the inside of the celestial sphere, having an infinite radius and the earth as its centre.Reason : The stars are at large distance from the earth' surface.

Assertion : The stars appear to trace out the same path in twenty four duration. Reason : The earth rotates steadily about its axis.

Assertion : The direction of a particular star at observation station appears to rotate steadily about the direction of the pole. Reason : The celestial sphere apparently appears due to rotation of the earth.

Assertion : Though the distances of stars from the earth vary, they are assumed to be studded to a celestial sphere. Reason : The linear size of the sphere is irrelevant as all the six elements of the astronomical triangle are only considered, and not the distances of terrestrial triangle.