This most accurately models my Biorhythm equations because Biorhythms are sin functions.
Parameter A = distance between highest/lowest rating and the middle, or, neutral rating (0) Parameter B = How long it takes to restart the cycle Parameter C = The amount of days after January 1st the birthday is Parameter D = Average/Middle rating for each Biorhythm
Parameter A is 1 because the amplitude of the function does not fluctuate past one singe unit. (The y-axis represents the ratings of each Biorhythm). Parameter D is 0 because the midline or average rating of each Biorhythm is represented as the x-axis. Moreover, the y-axis only shows -1 through +1. Parameters A and D set the foundation and overall frame of the Biorhythm functions.
When a "t" value is placed in the equation, these B values turn that amount of days after time "0" into an angle measure (radian as a ratio of the full period (2pi)) that will show you how many days/degrees/radians you are in through your specific Biorhythm cycle.