The Astronomical Card
This card represents a person’s julian birth date and secondary life path. It uses the Julian date of one’s birth. The Astronomical Card is calculated by taking the Julian Date for the date, dividing by 52, and returning the remainder as the solar value.
The formula is (JD - (52 x (JD/52))).
The Julian day number associated with the solar day is the number assigned to a day in a continuous count of days. This begins with the Julian day number 0 assigned to the day starting on 1 January, -4712 (astronomical calendar) or January 1, 4713 BC (universal time). The Julian day is used with a fractional component for calculations. Julian dates are widely used as time variables within astronomical software.