Aomori (Aomori Prefecture Japan)

From the city website:

The City Emblem, adopted in 1901, is derived from the Chinese character "ao" (青),meaning blue or green. The lower part of this character is said to represent the moon and the upper part the Big Dipper. The circle in the City Emblem, therefore, stands for the moon while the seven-pointed star is the North Star, part of the Big Dipper. This further represents Aomori's position at the northernmost extremity of the Japanese mainland.

Phil Nelson, 24 August 2006

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The city flag was adopted on May 12th 2005 by Prefecture Notice No 57. The white flag charged with green and blue city emblem in the center. The flag proportion 7:10.

The white stands for clean citizen, the blue for water of Mutsu Bay and the green for rich nature. The city emblem is a stylized kanji 青 AO. The circle represents kanji 月 lower part of 青 and seven pointed star represents upper part of 青. Linken to the Big Dipper, the star represents Aomori is located in the northern end of Mainland Japan.
Nozomi Kariyasu, 23 October 2009

The city flag charged with the city emblem all in green was in use between July 26th 1972- May 12th 2005.
Nozomi Kariyasu, 23 October 2009