During the waxing crescent phase, the right side of the moon is illuminated as seen from Earth.

Here's why:

* Waxing means the illuminated portion of the moon is growing larger.

* Crescent means a small sliver of the moon is illuminated.

Imagine the moon as a clock face. During the waxing crescent, the illuminated portion starts on the right side (around the 3 o'clock position) and gradually grows towards the left.