Flag of the Philippines — construction sheet
Own work.  Geometry and dimensions obtained from:

Executive Order No. 23, s. 1936
A copy of what is supposedly the original 1936 drawing which can be viewed at Flags of the World (FOTW) Philippines - historical flags of 20th Century — 1936 specifications1. The maximum length of the flag is twice its width; the minimum length is twice the altitude of the equilateral triangle.
2. Any side of the equilateral triangle is as long as the width of the flag.
3. (See accompanying illustration.) Solid golden sunburst without any markings―Sun with eight rays, equally spaced; Arc x with Sun ray = Free arc y; two opposite rays in horizontal axis and two in vertical axis; sun’s diameter D=w/5; each ray has one major beam, twice as broad as the minor beam on either side; length of major beam R=5/9 D; length of minor beam r = 4/5 R.

4. Three five-pointed golden stars of equal size, each star with one point directed to the vertex of the angle enclosing it; diameter of circumscribed circle of each star = 5/9 D diameter of inscribed circle of each star = 2/9 D; distance from each corner = D/2.— relevant portion of text from Executive Order No. 23

Note: The text in the executive order does not provide the location for the centre of the sun, but the drawing provides enough information to calculate it.

Note: The government created another specification drawing in 1955;  some of the listed dimensions appear to conflict with the 1936 executive order.  It is assumed that the 1936 executive order takes precedence over the 1955 drawing.
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