The youngest of six sons and two daughters, Stratton was born at
Edgbaston in Birmingham, to Stephen Samuel Stratton, a music critic and historian, and Mary Jane Marrian. He remembered
Dvorak and
Ebenezer Prout visiting his father. In 1891, he received a scholarship to King Edward's Grammar School in
Five Ways, Birmingham, advanced to
Mason College in 1897 (which later became the
University of Birmingham) and won an entrance scholarship to
Gonville and Caius College, Cambridge, in 1900, entering the university in October 1901. He took a London BA (External) in Greek, Latin and maths in 1903, and graduated in 1904 with the distinction of Third Wrangler in Part I of the Mathematical Tripos (
Arthur Eddington was Senior Wrangler that year). He was placed in Class I, Division II of the second part of the Tripos the following year, also receiving the
Tyson Medal in astronomy and an Isaac Newton Studentship. In 1906 he won a
Smith's Prize and was elected a Fellow of his college, which he remained until his death. ==Military service==