Japan’s national flag is a white 2:3 rectangle bearing a centered crimson disc whose diameter is three-fifths of the flag’s hoist.
Specification
The construction is governed by the Act on National Flag and Anthem of 1999. The sun disc is placed at the exact center of the white field, giving the flag a compact geometric definition.
Reference colors
HEX #BC002D / common screen referenceHEX #FFFFFF / RGB 255, 255, 255Construction notes
Draw a rectangle three units wide and two units high. Locate the intersection of its diagonals, then draw a circle centered there with a diameter equal to 60% of the hoist. The statutory color is described as a deep red; digital equivalents should be labelled as reproductions unless tied to an authoritative color system.
Historical record
The sun-disc design has a much longer history than the 1999 act. It was used as a national emblem and ensign before the modern statute formally established the Nisshōki as Japan’s national flag.
Source trail
This starter record follows the construction schedule attached to Japan’s Act on National Flag and Anthem. Document links and translation notes will be added during the citation pass.