This is a biographical study of Alexander William Roberts, a Free Church of Scotland missionary educator who in 1883 was posted to the Lovedale Institution at Alice, South Africa. Inspired by the night sky of the southern hemisphere, Roberts became a leading observer of variable stars and an early contributor to the theory of close interacting binary stars. He actively promoted the development of colonial scientific culture and was elected president of the South African Association for the Advancement of Science in 1913. His teaching career at Lovedale fostered a commitment to the interests...