Stability of the Solar System essentially the distance from sun to earth). These are now known as the Kirkwood gaps. Some asteroids were later discovered to orbit in these gaps, but their orbits are unstable and they will eventually break out of the resonance due to close encounters with a major planet. Another common form of resonance in the Solar System is spin–orbit resonance, where the period of spin (the time it takes the planet or moon to rotate once about its axis) has a simple numerical relationship with its orbital period. An example is our own Moon, which is in a 1:1 spin–orbit resonance
Brook Green Suite written in 1933, which has full enharmonic relations but remains austere. The final movement, the Dance, is based on a melody heard by Holst while in Sicily. The piece also originally contained a fourth movement, a Gavotte, which was removed after the first informal performance in 1934, the last concert Holst attended. In early 1929, Holst heard a tune during a puppet show and he utilised it in the last movement. Brook Green Suite Gustav Holst's Brook Green Suite, H. 190, was written in 1933 for St Paul's Girls' School junior orchestra for strings and consists of 3 movements. Holst