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They watch eclipses and changes of phase as the planets and moons move through their orbits.
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Since Google announced that they were shutting down their Google Plus social platform by end of next summer, organizers of OpenSim-related communities on that platform have begun searching for an alternative.
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If the students makes any mistake, they can review the scene and try again.
Nowadays it can also be performed via online applications in virtual worlds like AChat.