# How to Create a Biorhythm Chart

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##### SUMMARY
It is possible to use Microsoft Excel to create a biorhythm chart. Abiorhythm chart tracks the physical, emotional, and intellectual cycles ofa person over a 29-day period. These three cycles are further broken downto the following day periods:
`   Physical:      23-day period   Emotional:     28-day period   Intellectual:  33-day period				`
On a chart, these three cycles duplicate a sine wave pattern. Days thatfall above the X-axis are said to be good days, and conversely, days thatfall below the X-axis are said to be bad. To chart a biorhythm, followthese steps:
1. Enter the following data in a worksheet:
`        A1: Name:           B1:                    C1:        A2: Birth date:     B2:                    C2:        A3: Today's Date:   B3:                    C3:        A4:                 B4:                    C4:        A5:                 B5: Days Elapsed       C5:        A6: Period          B6: Since Birth Date   C6: Date        A7:                 B7:                    C7:        A8:                 B8:                    C8:					`
2. In cell B3, type the following formula to return the current date:
B3: =TODAY()
In cell B2, type the date of birth of the person whose biorhythm is being charted. In cell B1, type the name.
3. To create a series that will represent the days in each 29-day period, type the following values into the following cells:
A7: -14
A8: -13
Select cells A7:A8. Use the fill handle to fill the cells down through cells A9:A35.
4. In cell B7, type the following formula to calculate the number of days that have elapsed between the day in the 29-day period and the birth date:
B7: =\$B\$3+A7-\$B\$2
With cell B7 selected, use the fill handle to fill the formula down through cell B35.
5. To create the dates that fall in the 29-day period, enter the following formula in cell C7, and then fill it down to cell C35:
C7: =\$B\$3+A7
6. Type the following data in the worksheet:
D6: Physical
D7: =SIN(MOD(\$B7,23)*2*PI()/23)

E6: Emotional
E7: =SIN(MOD(\$B7,28)*2*PI()/28)

F6: Intellectual
F7: =SIN(MOD(\$B7,33)*2*PI()/33)
Select cells D7:F7 and fill the formulas down through cells D35:F35.
7. To create the chart do the following:

In Microsoft Excel 97 and Microsoft Excel 98

1. Select the following range of cells on the worksheet: C6:F35.
2. On the Insert menu, click Chart.
3. In the Chart Wizard, Step 1, box, under "Chart type," click Line, and then click Next.
4. Under "Select a format for the Line chart," click chart type 1, and then click Next.
5. Click Next in Steps 2 and 3.
6. In Step 4 click "As new sheet:," and then click Finish.
7. Double-click the Y-axis. Click the Patterns tab. Under Axis, click to select None, and then click OK.
8. Double-click the Legend. On the Format menu, click the Placement tab. Under Type, click to select Bottom, and then click OK.
9. Double-click the Emotional data line. Click the Patterns tab. Under Marker, click to select Custom. Click the Marker Style arrow, click the triangle (the third option), and then click OK.
10. Double-click the Intellectual data line. Click the Patterns tab. Under Marker, click to select the Custom option button. Click the Marker Style arrow, click the circle (the eighth option), and then click OK.
11. On the Chart menu, click Chart Options. Click the Titles tab. In the Chart title box, type Biorhythm Chart, and then click OK.
In versions 5.0 and 7.0
1. Select the following range of cells on the worksheet: C6:F35.
2. On the Insert menu, click Chart, and then As New Sheet. Click Next.
3. In the ChartWizard box, under "Select a chart type," click Line, and then click Next.
4. Under "Select a format for the Line chart," click chart type 1, and then click Finish.
5. Double-click the Y-axis. Click the Patterns tab. Under Axis, click to select None, and then click OK.
6. Double-click the Legend. On the Format menu, click the Placement tab. Under Type, click to select Bottom, and then click OK.
7. Double-click the Emotional data line. Click the Patterns tab. Under Marker, click to select Custom. Click the Marker Style arrow, click the triangle (the third option), and click OK.
8. Double-click the Intellectual data line. Click the Patterns tab. Under Marker, click to select the Custom option button. Click the Marker Style arrow, click the circle (the eighth option), and then click OK.
9. On the Insert menu, click Titles. Click to select the Chart Title check box next to Chart Title. Click OK. Type Biorhythm Chart, and then press ENTER.
##### REFERENCES
For more information about charting in Microsoft Excel 97, click ContentsAnd Index on the Help menu, click the Index tab in Excel Help, type thefollowing text
charts, creating
and then double-click the selected text to go to the "Create a chart(Microsoft Excel)" topic. If you are unable to find the information youneed, ask the Office Assistant.