If you are eligible for reinstatement and wish to return to federal service the reinstatement program affords you an advantage other applicants don't have. You will have to locate openings and at a grade at or below the grade you left federal service. The process is straight forward and outlined below.
The period number is an identifier used to describe the row of the standard periodic table in which the element appears. The lanthanoids and actinoids are extensions of Periods 6 and 7 respectively, hence their assignment to those Periods.
The number of your day of birth (e.g., the 1st, 2nd, 3rd, etc.) If your birth date consists of two digits, add them together to end up with only one digit (e.g., the 22nd becomes 2 + 2 = 4). This Cycle number is in effect in the middle part of your adult life, from approximately age 36 to 54.