Why are the colors on the color wheel in a spefic order?

Because when you mix the 3 primary colors (Red, yellow and, blue), a new color is formed called secondary colors (green, orange, purple). Then when you mix the secondary colors, new colors will form called tertiary colors (yellow-orange, red-orange, Red-purple, blue-purple, Blue Green, yellow green).

in june, we will have been married for eighteen months. (i am assuming this is what you want? the sentence, as you have presented it, is grammatically incorrect--   you want it corrected, yes? )

everett ross tried the pasta but liked the soup more