THE EARTH AND THE SOLAR SYSTEM, KEPLER'S LAWS, SUNSPOTS, SOLAR FLARES, PROMINENCES, PHOTOSPHERE, 97RANSFORMER97I, CORONA. FUNDAMENTALS OF POTENTIAL FIELD THEORY. ROTATION, GRAVITY FIELD AND SHAPE OF THE EARTH. PRINCIPLES OF ISOSTASY. EARTH TIDES. GEOMAGNETISM, SECULAR AND DIURNAL VARIATIONS, DYNAMO THEORY, PALEOMAGNETISM, ROCK MAGNETISM.