## 1. Longitudes are measured from 0° to

## 2. If ‘δ’ is the declination of the star and ‘φ’ is the latitude of the observer then the hour angle of the star at elongation is given by

## 3. If ‘δ’ is the declination of the star and ‘φ’ is the latitude of the observer, then the azimuth of the star at elongation is given by

## 4. The altitude of a circumpolar star is maximum when it is

## 5. Rotation of the camera at exposure about its vertical axis, is known as

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