Sixty-three is seven times nine and reduces to nine. Two concrete traditional counts fix on it. The Mishnah, the foundational compilation of rabbinic law, is divided into sixty-three tractates, masekhtot, arranged in six orders, a structure so standard that to name the tractates is to survey the whole of the early rabbinic curriculum. And in Tamil Shaivism the Nayanars, the poet-saints devoted to Shiva whose lives are gathered in the Periya Puranam, are counted as sixty-three, a fixed hagiographic set venerated across the south Indian temples.
In chemistry, sixty-three is the atomic number of europium, discovered in 1901 by the French chemist Eugene-Anatole Demarcay and named for the continent of Europe; it is prized today for the vivid red phosphors it produces in television and display screens.
Sixty-three factors as 3^2 x 7 and carries 6 divisors in all. Summing its proper divisors gives only 41, short of the number itself, which places it among the deficient numbers in the same classical scheme.
Florence Campbell, a student of Balliett's, restated and extended the chart in Your Days Are Numbered in 1931, and Juno Jordan, founder of the California Institute of Numerical Research, standardised the modern four-part chart of life path, expression, soul urge and personality numbers in 1965; both writers worked from name and birth date rather than from any older number philosophy.