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Bar Billiards is a game that dates back to France and came to the UK in the 1930s. We specialise in the renovation and supply of all the antique bar billiard tables. I came up with the design behind Oracle Billiards. Billiards method. Clonk the Earth with something big and heavy, causing it to alter course. Let me emphasize the words "big", "heavy" and "clonk". Plan it right, and you can couple it together with the Earth with gravity alone, using the solar wind to balance out the Earth's gravitational attraction. Gravity assistance. This is a method originally proposed as a means of moving Earth to a higher orbit around the Sun in order to save it from the Sun's inevitable Red Giant expansion. Build an enormous lightweight "hat" for the Sun, which catches the Sun's rays. The most obvious major drawback with this method is that right now there aren't even theories as to how you could possibly build rocket engines of the sort proposed here. Solar sail method. I can't honestly add much to that article except to say that to move the Earth substantially, the sail used is going to have to be pretty big. Direct matter propulsion. Same method as above, just using gigantic mass drivers/railguns to fire huge quantities of matter away from Earth, instead of a rocket exhaust.

Suppose they were all at the exact same point on Earth (which they won't be, thus mitigating the effects of the jump). Ceres, the solar system's largest asteroid, has less than 1/40,000th the mass of Earth; the Moon, a mere 1/80th. These objects are the heaviest you're likely to find - there are heavier moons and entire planets you could consider using, but to be honest from this point of view it looks more like using a succession of hundreds, thousands or tens of thousands of smaller asteroid impacts would be a better bet. Basically, the point here is that modelling impacts like these is a tricky business. Atmospheric considerations are ignored here since it is far more energy-efficient to manually remove the Earth's atmosphere, move the planet, and reinstall it. Maybe. Or better yet: the Earth already has a standing magnetic field; perhaps we could construct a cylinder of cable around it, and pass current to move it using Lorentz forces. Suppose everybody on the planet weighed 100kg (which is an overestimate, 70kg is more like it, probably less). Getting everybody in the world to jump at the same time. Which means the distance the Earth moves when everybody jumps will be one trillionth of the distance that all the people jumped: that is to say, 10-11 metres, or about half the radius of a hydrogen atom.

Better, you could use many, many asteroids one after the other in a steady stream, and cut down the total time significantly. It involves asteroids, like the above method, only instead of direct impacts, this time we just steer them past the Earth, allowing rock and planet to exchange a little momentum, with the result of an Earth moving on a slightly different track and an asteroid moving on a significantly different one. This was a little prototype and never reached a stage of serious development. I know what you're thinking. You never know when you might want to significantly alter the orbital path of the Earth. Alternatively, as the Earth's angular kinetic energy is negligible compared to its orbital kinetic energy, you might consider diverting a relatively small amount of resources to simply stopping the Earth from spinning at all, before beginning the main project. If there was some way to electrically charge the Earth, What is billiards by dumping lots of identically charged particles onto the Earth or just ionizing particles already on Earth - a large amber rod might perhaps be in order - then we could use magnetic fields to drive the planet in the direction we wanted it to go.