The point in the orbit of a satellite where it is closest to the sun.

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Multiple Choice

The point in the orbit of a satellite where it is closest to the sun.

Explanation:
The key idea is how distances change in an orbit around the Sun. In an ellipse, the object gets as close as possible at the point called perihelion and as far as possible at aphelion. Since this question asks for the point closest to the Sun, the correct term is perihelion. Perigee would be the closest point to Earth, not the Sun, so that would apply to Earth-centered orbits. The other two options refer to tides, not orbital distances: semidiurnal tide is the pattern of two high tides each day, and slack water is the brief calm between high and low tides.

The key idea is how distances change in an orbit around the Sun. In an ellipse, the object gets as close as possible at the point called perihelion and as far as possible at aphelion. Since this question asks for the point closest to the Sun, the correct term is perihelion. Perigee would be the closest point to Earth, not the Sun, so that would apply to Earth-centered orbits. The other two options refer to tides, not orbital distances: semidiurnal tide is the pattern of two high tides each day, and slack water is the brief calm between high and low tides.

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