30 OVER HET BEREKENEN DER GEMIDDELDE 



11.713 ,. _ nn,« .. . _ 0.564 



'', 



-jj- .«2 = 0.976 ,«j t, = -1^^ ^, = 0,047 ,., 



12,084 , „„, 0,321 „„„„ 



-^ fi, = 1,007 ,,j u, = -^ «1 = 0,027 f,, 



11.490 ..„- ^ ^ 0,813 _.„„ 



11,938 .„_.. 0,813 ..„„ 



—j-g— fs = 0,99o /t3 j u = -^4" f'2 = 0,035 ,u 



Voorts : 



^ (3COS.2D — 1) = Z , is (3 Cos. 2D'—1)A' = L 



S^ Sin. 21) =v, Ti S A^Sin.ZD' = V 



^ Cos. ' D = w , is A'Cos.'D' = W 



/?' = /? + 6' 

 Q =Gemidd. M + Z (a) + L (A) — au {(^J^^m. (Z?—?"!) — (y,) Cos. (/3'_7''J-)j 



— M ï« [(^j) Sin. 2 (^— 7' >) — {,j,) Cos. 2{0'— Vi)] 

 P. =V{X.)+r,v[0rJ(7os. /3—{,/,)Sm. fi'] +t, zv[i.v,)Cos.2j3' — (y^)Sm.&.3'} 

 Qi =V(YJ-s,i,{(,ï,)5uj. ^'—{y,)Cos. fi'}—u,iu[(.v,_)Sin.2{/3'~Q'')—(y^)Cos.Z{ir—6'}} (15) 

 P, = W(XJ+r,iü[(a;JCos.2/?'— (yj5m.2/3'j— <j u {(.,;jCos./3'— fyJ5i;i..a'} 

 Q, = Vf(Y,)—s,^v[{a,^)Sin.2fi'—(y,)Cos.20'] +u,v [(i?;i)5m.(/3'+20'J-(y,)Cos.(/3'+20')} 

 P3 =-P{X,)+rJl{a,,)Cos.30'—{,j,)Sm.3J3-] p^ = p(xj 



Q3 = I' (^i)-^J{i''«3)Sin.3/3'~(y,)Cos.S/3'] Q, = P (Y J . 



De getallen r,, s,, <j, enz. zijn de volgende: 

 i\ Bij gemiddelden van 7 maansdagen: 

 s = 0,032 

 u = 0.023 

 r, = 0,889 . . t, = 0,029 r, = 0,637 . . t^ =. 0,043 r, = 0,307 

 », = 0,920 . . «, = 0,037 s, = 0,GÖ7 . . «, = 0,024 «3 = 0,316. 



