A captain of a fishing boat notices that during a certain time each year high tides are higher and low tides are lower. Which conclusion could the captain accurately draw?

The Moon is at the closest part of its orbit around Earth; the Sun and the Moon form a straight line with Earth.

Explanation:

The conclusion the captain could draw accurately is that;

The moon is probably at the closest part of its orbit moving round the earth. In addition, that the sun and the moon have formed a straight line with earth. This is due to the fact that high tides are higher and low tides are lower at a particular time each year.

it takes about 30 days for it to break down