COMET OF 1889-1896-1903 251 



Treating these equations by the method of least squares, 

 making use of the usual checks upon the computation, the fol- 

 lowing normal equations are found, in which the coefficients 

 are numbers : 



Normal Equations. 



X y z t ti 



6.082452+0.456189+0.336503—2.334170+5.872832—4.540830+2.430941=0 



7.926364+4.160742-L0.171 294+0.495343—0.540870+1.044635=0 



5.619482+0.307813+0.360771—0.318383+0.765504=0 



3.939279—2.230876+0.456194-1.682773=0 



5.708964—4.501701 + 2.437035=0 



4.874328 — 2.224427=0 



The solution of these equations gave, 



Whence were obtained 



A/z = + o .000480 ± o .0041 



The remaining errors are 



