The Earth's orbit influences much of our lives, from the length of our year to the changing of the seasons. We are travelling at a speed of approximately 30 kilometres per second or 110 million metres per hour around the Sun yet we don't feel ourselves moving! The Earth takes 365 and a quarter days to orbit the Sun, giving us our 365 day year with an extra day once every four years as a 'leap year'. The Earth is also spinning on an axis, tilted at 23°. This means that different parts of the…