East sky

The eastern sky is that half of the starry sky that extends from north to east to south . This corresponds to an azimuth from 0 ° to 180 °. The eastern sky thus covers a quarter of the entire celestial sphere .

The term is important for astronomy and geodesy insofar as all the stars rise in the eastern half of the sky . The increase in the elevation angle (or decrease in the zenith distance ) is more or less oblique, which is a consequence of the celestial coordinates ( declination ) and the parallactic angle (see also Greatest Digression ).

This influences the measurement of star passages and the choice of the most suitable instruments for the measurements .

See also: star orbit , earth rotation