Where should a container with animals be dropped by parachute so that an astronaut flying in a circular orbit would return them to Earth?

This can be done in three ways: 1) throw the container back (thereby reducing its speed relative to the ship, 2) throw the container down (thereby transferring it to an orbit of a smaller radius, 3) combining both movements, throw the container back and down. The first method is the most energy-efficient.

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