Why isn the moon visible every night (or every day)?
The moon is only visible during part of each month. Whether it’s visible during the day or night depends on how “far” the phase is from full or new. The moon orbits the earth once (approximately) each month. As a result, sometimes the moon appears very close to the sun in the sky, and sometimes it is far away from the sun in the sky. When the moon is opposite the sun in the sky (which is when full moon happens), it will rise as the sun sets and set as the sun rises. Therefore, a full moon will be up all night long, but not during the day. The further before or after full moon (in days), the more the moon will be visible during daytime hours (when the sun is in the sky). However, as the moon gets very close to new moon (when the moon and the sun are closest together), it is very difficult or impossible to see in the daytime sky. [The answer to question #19 may also help.
