A "Moon" day is the period it takes to make one revolution on it's axis (or Sidereal rotation period) this is currently 27.321582 Earth days.
29.5 earth days
The lunar day is about 29 earth-days long.
28 days
1 "day" on the Moon = 29.5 days here on Earth.
A day on the Moon is 28 days because the Moon keeps one half turned towards the Earth. You can see which part of the Moon has sunlight by looking at it, the bright part is the place where it's day.
A day on the moon, known as a lunar day, lasts about 29.5 Earth days. This is because it takes that long for the moon to complete one full rotation on its axis.
A day on the moon is about 29.5 Earth days long, which is roughly equivalent to a lunar month. A year on the moon, however, is about the same length as a year on Earth, as it takes the moon approximately 27.3 Earth days to complete one orbit around the Earth.
It isn't. A "day on the Moon" is about 29.5 Earth days; a year is about 365 days.
A day on the moon is 29.5 Earth days. The moon takes 27.3 days to fully orbit the Earth. This is called a sidereal day.
If you stay in one place on the moon, then the sun rises, stays up for about 2 Earth weeks, then sets, and stays down for about another 2 Earth weeks. That makes a complete "day" on the moon as long as 27.3 earth-days.
One complete lunar 'day' is about 29.5 Earth days. So any spot on the moon has the sun up in its sky and light for 14.7 Earth days, followed by the sun down and not in the sky and darkness for the next 14.7 Earth days.
The moon circles the earth once every 28 days approximately. It keeps the same face towards the earth at all times and so as it circles the earth this means that, relative to the sun, it rotates once on its axis in this time. Therefore the moon shows its rear side towards the sun when it is a new moon (and the face of the moon facing earth is dark), and its earth-facing sun towards the sun when it's full moon (and the moon is bright). This new moon and full moon cycle lasts once every fourteen days. Therefore the moon's night is 14 earth days long, and its day is also 14 earth days long.