Compute the following 4 items, adding each, when found, to the total of the
previous items. When an item or total exceeds 7, divide by 7, and keep the
remainder only.

_The Century Item_.--For old style (which ended September 2, 1752) subtract
from 18. For new style (which began September 14) divide by 4, take
overplus from 3, multiply remainder by 2.

_The Year Item_.--Add together the number of dozens, the overplus, and the
number of 4's in the overplus.

_The Month Item_.--If it begins or ends with a vowel, subtract the number
denoting its place in the year from 10. This, plus its number of days,
gives the item for the following month. The item for January is "0;" for
February or March (the 3d month), "3;" for December (the 12th month), "12."

_The Day Item_ is the day of the month.

The total thus reached must be corrected by deducting "1" (first adding 7,
if the total be "0"), if the date be January or February in a leap year;
remembering that every year divisible by 4 is a leap year, excepting only
the century years, in new style, when the number of centuries is _not_ so
divisible (e.g., 1800).

The final result gives the day of the week, "0" meaning Sunday, "1" Monday,
and so on.

EXAMPLES.

1783, _September_ 18.