CATALOGUE OF POLAR STARS. 



233 



The following example is given in illustration of the application of equations (G), 

 the problem being to reduce from the mean equator and equinox of 1875.0 to tlie 

 mean equator and equinox of 18G7.0 and of 1883.0. Given the co-ordinates of 

 Groombridge 1119 for 1875.0, to fuul the values for 1807. and 1SS3.0. 



h. m. s. 



a for 1875.0 = 7 29 5.631 



d for 1875.0 = +88 59 37.69 



