Explanation:

given

16 aug 1997 = saturday 

16th aug 1998 = sunday ( +1 )

simillarly 

16 august 1999 = monday ( +1) 

now days left from 16th aug to nov 30 

August  = 15 days ( 1 odd days ) 

september = 30 days ( 2 odd days ) 

october = 31 days ( 3 odd days ) 

november = 30 days ( 2 odd days ) 

2+ 3+ 2 = 7 days 

= no odd days 

on 30th nov. 1999 its tuesday ,.

Then in December 1999 ,  Sunday will fall on 5th, 12th , 19th and 26th .