Total lunar eclipses always occur:

Options

A. at the time of new moon
B. at the time of full moon
C. during either equinox
D. during either solstice

Explanation

To determine when total lunar eclipses occur, we need to understand the alignment of the Earth, Moon, and Sun. Here’s a step-by-step solution:

1. **Understanding Lunar Eclipses**: A lunar eclipse happens when the Earth comes between the Sun and the Moon, blocking the sunlight that normally reflects off the Moon's surface.

2. **Conditions for Total Lunar Eclipse**: For a total lunar eclipse to occur, the following conditions must be met:
- The Moon must be in the full moon phase.
- The Moon must be positioned at a lunar node, which is the point where the Moon's orbit crosses the Earth's orbital plane.

3. **Timing of Full Moon**: The full moon occurs when the Sun, Earth, and Moon are aligned in a straight line. This is the only phase of the Moon when a lunar eclipse can happen.

4. **Conclusion**: Therefore, total lunar eclipses always occur during the full moon phase.

The correct answer to the question is: **Total lunar eclipses always occur at the time of full moon.**