Size of this New Zealand flag patch: 6.5 x 4 cm (2.56 x 1.57 inch)
The flag of New Zealand consists of a dark blue base, which symbolizes the sea and sky. The British Union Jack in the upper left quarter represents New Zealand's British Commonwealth heritage. On the right side of the flag are four, five-point red stars outlined in white. These stars symbolizing the constellation 'the Southern Cross', represent the stars Alpha, Beta, Gamma and Delta. The stars are positioned to represent a southern cross, which is a prominent constellation in the southern hemisphere, and represents New Zealand's geographical position to the rest of the world.
The New Zealand flag was adopted on 12-06-1902, but the flag was actually introduced in 1869. New Zealand gained independence from Britain on 26-09-1907. Until 1865, New Zealand used the British Union Jack as its flag. In 1867 a flag similar to the current one was introduced with the letters NZ on it. The letters were then replaced by the four stars in 1869.
There have been several attempts to change the flag of New Zealand since 1973, however, by New Zealand law, a 65 per cent majority vote is needed to change the New Zealand flag. So far this has not happened as most people oppose changing New Zealand's flag (source: worldflags101).