Re: When referring to the lunar phases, what is meant by 'No Moon'

Usually, "no moon" just means that the lunar cycle is at a point at which the moon rises and sets entirely during the daytime - so if you look up at night, you just won't see one! This is of course not to say that the moon no longer exists, just that the timing is wrong to see it at night. Astronomers like nights with no moon because it cuts down on reflected light in the atmosphere. So observations are often scheduled for "no moon" nights or for parts of the night when the moon has already set.

If the author was being careless, they might also have meant "new moon," which is when the moon is more or less between the sun and the earth, so that we can't see any reflected light from it.