Each turn proceeds through the following sequence of play.

DATE A new turn begins with the advancing of the date.
~~~~ Depending on the current year, the date advances from
twenty years to one year. The current date is found in the
date window of the map display.

DISASTERS At the beginning of a new turn there is a possibility
~~~~~~~~~ of a natural disaster striking a city in the world. Any
disaster that occurs is reported and take effect
immediately. Disasters can result in a loss of population
or the destruction of a city improvement. Most disasters
can be prevented by a specific city improvement or
technology. If the target city is prepared for the
disaster, then the disaster does not occur.

CITY CHECK Each city in your civilization is check individually
~~~~~~~~~~ for production, growth, unrest, maintenance, and scientific
research. All steps are carried out for one city before
the next is checked.

PRODUCTION: If the city produces sufficient surplus
resources to complete the item the city is producing, that
item is added to the city. If your city does not produce
sufficient resources to support all of the existing units
for which it is the home city, units are destroyed until
enough support is available. Units farthest away from the
city are destroyed first.

GROWTH: If the city produces sufficient surplus food, it
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