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
Solar hot water in Australia at least one of the following concession cards: Following to the installation, the householder has up to three months to send in the application to receive the rebate if the below criteria is met. The water heating system does not replace existing one: The water heating system does replace existing one: No Rebates other than the Federal Government's are offered by the Tasmanian Government at the moment. Sustainability Victoria’s solar hot water program, sponsored by the Victorian government, offers rebates to householders who have installed a system abides that the following criteria: New houses and buildings can get a rebate