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
Astrology suite "The Planets". Written by the British composer Gustav Holst (1874–1934), and first performed in 1918, the framework of "The Planets" is based upon the astrological symbolism of the planets. Each of the seven movements of the suite is based upon a different planet, though the movements are not in the order of the planets from the Sun. The composer Colin Matthews wrote an eighth movement entitled "Pluto, the Renewer", first performed in 2000. In 1937, another British composer, Constant Lambert, wrote a ballet on astrological themes, called "Horoscope". In 1974, the New Zealand composer Edwin Carr wrote "The Twelve