In order to visualize relationships of space for teaching mathematical geography, this booklet shows how the globe may be used as a model of the earth in space. Its purpose is to stimulate the teaching of mathematical principles in secondary-school geography and earth science through a survey of basic principles of global usage. The introduction on using the globe discusses what it is, its advantages, its limitations, types of globes, and types of mountings. A discussion of the lines on a globe includes number and spacing of grid lines, parallels of latitude, meridians of longitude, direction in latitude and longitude, finding locations on a globe, and the great and small circles. How the earth is illuminated by sunlight involves its position in space. The discussion about illumination covers artificial illumination of the globe, summer solstice, winter solstice, equinoxes, length of day and night, subsolar point, tropic lines, natural illumination, sunrise and sunset, and location of the subsolar point. The concept of time is presented in relation to light and space by describing earth as a timepiece, noon and the meridian, equation of time, analemma, time and longitude, standard time, effect of repeated time changes, international date line, and time changes on the globe. (ND)