Just as a person has a horoscope cast for the moment of their birth, so too can states and nations have horoscopes cast for the moment of their beginning.
Sometimes the choice of date appears to be obvious.
In many cases the correct date is not so clear, and in most cases a nation or country has multiple birth charts.
For example, many astrologers take the date of England's horoscope as Christmas Day 1066 - the day when that William the Conqueror had the crown set upon his head.
There is also a chart set for midnight on 1 May 1707 (Old Style), the time of the Union of England and Wales with Scotland creating Great Britain.
The Union then grew again on 1 January 1801 with the Union of Great Britain and Ireland.
A further change took place as the Republic of Ireland left the Union, and the United Kingdom of Great Britain and Northern Ireland was created.
Another example of a country/state that has multiple 'birthdays' is France, which regained its independence after the occupation of the Second World War as the Fourth Republic on 10 October 1946, while the present French system came into being as the Fifth Republic after a referendum held on 28 September 1958.
Similarly in Germany the present state system came into effect with the enactment of the Basic Law in August 1949, yet it is also considered by most astrologers that a new state has come into being with German re-unification in October 1990.
In principle, any organization or object can have a chart cast for the moment of its 'birth'.
For example, the ship Titanic's horoscope is generally cast for noon on 10 April 1912 when the ocean liner first set sail.
The ship's chart showed its ascendant in opposition to Uranus, and Neptune (ruler of the sea) was squared to the Sun, both aspects indicating the potential for danger.
The chart also contains a 'Void of course Moon', a period in which the Moon does not make any applying major aspects with any of the planets before it enters the next sign: this is said to be a period in which new ventures are not likely to succeed.