An interesting fact about August 2009

This august has 5 Saturdays, 5 Sundays, and 5 Mondays. All these days are in single month – August 2009. If we look the last events, similar condition was happened in 1998, 1992, 1987, 1981 and so on. Hence it seems that it is not a scheduled event and not common too. When February get 29 days in a month, we call it leap year and that comes every four year. But what is it call? When we get a situation occurring once in more than 5 years? "Mosasu-5 year"! Mosasu is for Monday, Saturday, and Sunday with 5 days (Taking two initial letters of each day).