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| while (True): | |
| vp.rate(500) | |
| #Calculte the force using gravitationalForce function | |
| star.force = gravitationalForce(star,planet1)+gravitationalForce(star,planet2)+gravitationalForce(star,planet3) | |
| planet1.force = gravitationalForce(planet1,star)+gravitationalForce(planet1,planet2)+gravitationalForce(planet1,planet3) | |
| planet2.force = gravitationalForce(planet2,star)+gravitationalForce(planet2,planet1)+gravitationalForce(planet2,planet3) | |
| planet3.force = gravitationalForce(planet3,star)+gravitationalForce(planet3,planet1)+gravitationalForce(planet3,planet2) | |
| #Update momentum, position and time | |
| star.momentum = star.momentum + star.force*dt | |
| planet1.momentum = planet1.momentum + planet1.force*dt | |
| planet2.momentum = planet2.momentum + planet2.force*dt | |
| planet3.momentum = planet3.momentum + planet3.force*dt | |
| star.pos = star.pos + star.momentum/star.mass*dt | |
| planet1.pos = planet1.pos + planet1.momentum/planet1.mass*dt | |
| planet2.pos = planet2.pos + planet2.momentum/planet2.mass*dt | |
| planet3.pos = planet3.pos + planet3.momentum/planet3.mass*dt | |
| t += dt |
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