a waxing gibbous
When it is directly opposite, it would be a Full Moon. But the Moon spends half of its orbit on the side opposite the Sun, which includes all of the Gibbous phases from First Quarter to Last Quarter.
It would be the opposite. If we went to the moon when it was full, we would look back at an earth in shadow (a `new earth`) If we went to the moon when it was new, then it would be between us and the sun, so we would look back at a full earth. For a waxing gibbous from earth, the earth would be a waning crescent from the moon.
The crescent Moon implies a gibbous Earth, as seen from the Moon.
The time in which the whole face of the moon is illuminated - when the moon is on the opposite side of the Earth as the sun.
If you are standing on the full moon you would be facing the earth at night.
full moon
The "new moon" by definition is the moon phase where it is completely in the earth's shadow, and we cannot see it at all. New moon is the exact opposite of "full moon".
That would be the "Full Moon".
Waning gibbous.
The New Moon
New Moon Phase
New Moon Phase