* The sun and moon can be seen together: We often see the moon during the day, particularly during its crescent phases.
* The phases of the moon: The reason we don't always see the moon during the day is because of the moon's phases. These phases are caused by the changing angles of sunlight reflecting off the moon as it orbits Earth. During a full moon, the entire illuminated side faces Earth, making it visible at night. During a new moon, the illuminated side faces away from Earth, making it invisible.
* The saying's meaning: The saying "The sun and moon never seen together" likely refers to the fact that we generally don't see a full, brightly illuminated moon during the day. This is because the sun's brightness usually overwhelms the moon's light.
So, while the sun and moon *can* be seen together, the saying is a poetic way of expressing the idea that we rarely witness their full brilliance at the same time.
