Individual lifetimes have many cycles.

The pinnacle and challenge numbers can be used to help determine the vibratory influences of four of those cycles. A pinnacle number and a challenge number are applicable to each of those four cycles.

The first cycle begins at birth and ends somewhere between age 28 and 36. The next two cycles are 9 years each. The fourth cycle then extends until transition.

The pinnacle numbers can be any one of 1 through 9. The meaning of those numbers are similar to the meanings they would have for the life path (birth date number).

The challenge numbers can be any one of 0 through 8. Except for 0, the meaning of those numbers are an absence of the vibrations the number would have for the life path (birth date number). The number 0 indicates any or no vibration may be a challenge, which can be the most challenging of all and can also be the most rewarding of all when the 0 vibration is fully and comfortably integrated.

Cycles Based on Birth Dates has more information.