110 Transactions of the Royal Society of South Africa. 
Weighted 
year. 
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10 
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Nil months 
Maximum 
month 
Minimum 
Percentage of 
disturbance . 
Middle time of 
sunset . 
I 
II . 
Ill . 
IV 
V . 
VI . 
VII 
VIII . 
IX . 
X . 
XI . 
Noon 
XIII . 
XIV . 
XV . 
XVI 
XVII . 
XVIII . 
XIX 
XX 
XXI . 
XXII . 
XXIII 
Midnight , 
