Watson, you are basically making a rainbow in a circle. What colors you use is only limited by figuring out which are true (think primary crayon colorswithout black and brown) and whether or not they are shades (addition of black to the color) or tints, (the addition of white. A basic color wheel only has six colors three primary (red, yellow & blue) and three secondary colors green, oranges &Violet) after that is tertiary colors, between all the other colors. I don’t know the words for the myriad colors you could add between all those colors.. Sorry. Remember You are looking to change colors gradually so they move smoothly to the next color. Here is a nice description of the use of a color wheel.
https://color-wheel-artist.com/primary-colors/