To leverage Earth’s rotation during a launch, which direction should a rocket be launched?

• A. North
• B. West
• C. East
• D. South

Answer: (C)

Launching a rocket to the east takes advantage of Earth's rotation, which moves from west to east. By launching in this direction, rockets can utilize the rotational speed of the Earth to gain extra velocity. This not only reduces the amount of fuel required to reach orbit but also maximizes the effectiveness of the launch.

At the equator, the Earth's surface moves at approximately 1,670 kilometers per hour (about 1,040 miles per hour) due to this rotation. By launching eastward, the rocket benefits from this speed, allowing it to reach orbital velocity with less thrust. This is a fundamental principle of orbital mechanics and energy efficiency in space launches.