Yes, you are correct. New moon is invisible in terms of astronomy.
To be absolutely correct, when I’m saying new moon I mean the state which is known as neomenia. When crescent is already seen in the night sky.
It is possible to call it young moon if you like.
Despite of this Wiki says following about new moon:
The new moon in its original meaning of first crescent marks the beginning of the month in lunar calendars such as the Muslim calendar, and in lunisolar calendars such as the Hebrew calendar, Hindu calendars, and Buddhist calendar. But in the Chinese calendar, the beginning of the month is marked by the dark moon.
To be absolutely correct, when I’m saying new moon I mean the state which is known as neomenia. When crescent is already seen in the night sky.
It is possible to call it young moon if you like.
Despite of this Wiki says following about new moon:
The new moon in its original meaning of first crescent marks the beginning of the month in lunar calendars such as the Muslim calendar, and in lunisolar calendars such as the Hebrew calendar, Hindu calendars, and Buddhist calendar. But in the Chinese calendar, the beginning of the month is marked by the dark moon.
