Lots of historical events happened in 1609. One such event is on August 28th of 1609 Henry Hudson discovered Delaware.
Battle of Tashiskari happened in 1609.
Battle of DimDim happened in 1609-11.
War of the Jülich succession happened in 1609.
Basque witch trials happened in 1609.
The Starving Time
The invention of the Telescope by Galileo.
Siege of Troitse-Sergiyeva Lavra happened in 1609.
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The Starving Time in Jamestown was a period of starvation in the Jamestown colony. It occurred from 1609 to 1610.
The number 1609 can be a noun, or an adjective enumerating another noun. The year 1609 AD is a noun.
Henry Hudson sailed into what is now New York Harbour in 1609.
It is: 1609-4.5 = 1604.5