MyBiorythme

A mobile app that calculates and plots the 3 biorhythm cycles (physical: 23 days, emotional: 28 days, intellectual: 33 days) based on a birth date, with a graph to visualize the curves over 7 days.

Calculation:

- Lived days: instead of "age × 365 + days since birthday + leap days",

the code simply uses (targetDate - birthDate).Days. .NET natively supports the

Gregorian calendar (including leap days): the result is accurate and simpler

to maintain than manual counting, for a strictly identical result.

- Position in the cycle: liveddays % cycleLength (23, 28, or 33) — this is

exactly the "remainder of the division" described in the method.

- Displayed value (-100% to +100%)**: sin(2π × position / cycle length) × 100,

which gives the classic sine wave of the biorhythm (0 = critical day, +100 = peak, -100 = trough) rather than a simple day number.

- Critical day: detected by tolerance (|value| < 5%) rather than by strict equality,

because 23 and 33 being odd, the exact crossing of zero never falls exactly on a whole day.