Flag of Australia
 |
|
| Use |
National flag and state ensign 
|
|---|---|
| Proportion | 1:2 |
| Adopted | 11 February 1903 in use from 3 September 1901 23 February 1908 (current seven-pointed Commonwealth Star version) |
| Design | A Blue Ensign defaced with the Commonwealth Star (also known as the Federation Star) in the lower hoist quarter and the five stars of the Southern Cross in the fly half. |
Variant flag of Australia
|
|
| Name | Australian Red Ensign |
| Use |
Civil ensign
|
| Proportion | 1:2 |
| Design | A Red Ensign with the Commonwealth/Federation Star at the hoist, and the Southern Cross in the fly half |
The flag of Australia is a defaced Blue Ensign: a blue field with the Union Jack in the canton (upper hoist quarter), and a large white seven-pointed star known as the Commonwealth Star in the lower hoist quarter. The fly contains a representation of the Southern Cross constellation, made up of five white stars – one small five-pointed star and four, larger, seven-pointed stars. There are other official flags representing Australia, its people and core functions of government.
The flag's original design (with a six-pointed Commonwealth Star) was chosen in 1901 from entries in a competition held following Federation, and was first flown in Melbourne on 3 September 1901, the date proclaimed as Australian National Flag Day. A slightly different design was approved by King Edward VII in 1903. The seven-pointed commonwealth star version was introduced by a proclamation dated 23 February 1908. The dimensions were formally gazetted in 1934, and in 1954 the flag became recognised by, and legally defined in, the Flags Act 1953, as the "Australian National Flag".
Flags forming the Union Jack
The Australian flag uses three prominent symbols: the Union Flag, the Commonwealth Star (also the Federation Star) and the Southern Cross (or Crux).
In its original usage as the flag of United Kingdom of Great Britain and Ireland, the Union Flag combined three heraldic crosses which represent the constituent countries of the United Kingdom (as constituted in 1801):
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