Target Date: This is the date you want to view a biorhythm for. It starts out set for today, but you can change it to be any date in the future or past. Your biorhythm chart will be centered on the target date.
Range: This is the span of time that you want to chart. For instance, if you set the range to 28, we will create a chart that spans 28 days, centered on your target date.