Stability of the Solar System is unlikely any of the planets will collide with each other or be ejected from the system in the next few billion years, and the Earth's orbit will be relatively stable. Since Newton's law of gravitation (1687), mathematicians and astronomers (such as Laplace, Lagrange, Gauss, Poincaré, Kolmogorov, Vladimir Arnold and Jürgen Moser) have searched for evidence for the stability of the planetary motions, and this quest led to many mathematical developments, and several successive 'proofs' of stability of the Solar System. The orbits of the planets are open to long-term variations. Modeling the Solar System is a case of the
Gustav Holst to endure; and secondly, Holst is above all an orchestral composer, and that sure touch which distinguishes his orchestral writing is due largely to the fact that he has been an orchestral player; he has learnt his art, both technically and in substance, not at second hand from text books and models, but from actual live experience." With a modest income secured, Holst was able to marry Isobel; the ceremony was at Fulham Register Office on 22 June 1901. Their marriage lasted until his death; there was one child, Imogen, born in 1907. In 1902 Dan Godfrey and the Bournemouth