1. Johnson, M., Correlation of Cycles in Weather, Solar Activity, Geomagnetic Values, and Planetary Configurations (Phillips and Van Orden, San Francisco, California, 1946). Sanford, F., Smithsonian Misc. Coll., 95 (1936). Nelson, J., Trans. Inst. Rad. Eng., CS–2, 19 (1954).
2. Kurth, R., Introduction to the Mechanics of the Solar System (Pergamon Press, New York, 1959).
3. Flammarion, G., The Flammarion Book of Astronomy, 51 (George Allen and Unwin, Ltd., London, 1964).
4. Jose, P., Astron. J., 70, 193 (1965). This recent article suggests a connexion, between a 178-year cycle of Wolf number maxima and the rate of change of solar angular momentum. However, his results were based on the five outer planets only, and our investigation shows that the inner planets have a major effect on the rate of change of angular momentum.
5. Waldmeier, M., The Sunspot-Activity in the Years 1610–1960 (Zurich Schulthess and Co., Zurich, Switzerland, 1961).