The Biorhythm plot screen

The display shows the three biorhythm curves (physical, emotional and
intellectual), plotted for 65 days starting 7 days before the specified
start date.  Each dot on the horizontal scales represents 1 day.
Continuous vertical dotted lines indicate the first day of a month, with
the name of the month abbreviated at the top of the line.  The specified
start date is represented by three solid vertical lines, one for each
curve, 7 days in from the left edge of the display.

Three lines below the curves are used to mark those days which are
critical.  Days with a single critical (i.e. one curve crosses the
zero-line on those days) are marked on the "S" line, double criticals are
on the "D" line, and treble criticals (where all three curves cross on the
same day) are on the "T" line.





                             The List screens

The display gives a list of critical days for a fixed period from the start
date.  Single critical days are shown in light blue (appearing grey on a
mono monitor); double critical days are in bright white; treble criticals
are bright white on a red background (appearing white on grey).

Listing all criticals shows single, double and treble critical days,
covering a period of 200 days.  Listing only double and treble criticals
covers a period of 2000 days.

The letters p, e and i are shown to the left of each date displayed,
indicating which cycles are critical on that day.







                   Listing the next treble critical day

The program searches forward from the start date, checking each date to
determine if it is a treble critical day.  The year it is checking is
displayed in light blue (or grey) as the search proceeds.  When the next
treble critical is found, the full date is displayed.














                          Changing the start date

This function allows you to enter the start date of a new period of
interest.  Please note the following points about entering dates (which
apply to all times when the program prompts you for a date):

* The stroke characters (/) between the numbers are required.

* Dates before 1 Jan 1800 are not allowed.

* Years given in the range 0 - 99 are assumed to mean 1900 - 1999 and are
adjusted accordingly.

* When entering start dates (not birthdays), pressing only the return key
causes the program to use the current system date.





                         Changing personal details

This option allows you to enter the name and birthday of another person so
that you can check several people's biorhythms without having to restart
the program.















                           Compatibility testing

This option gives you a compatibility rating between yourself and another
person.  The rating is shown as a percentage for each of the three
biorhythm cycles.  Each percentage indicates the proportion of time during
which the other person's biorhythm is in the positive (or negative) phase
at the same time as your own is positive (or negative).

For example, a physical compatibility rating of 65% means that the physical
rhythms are both positive, and both negative, for 65% of the time, and that
for the other 35% your rhythm is positive when the other person's is
negative, or vice-versa.

Both sets of biorhythms are displayed in the same form as the plot screen.
Your rhythms are shown as a solid curve; the other person's appear as a
dotted curve.