When is the new moon born?

The rotation of the moon around the earth drives the Islamic or Hijri Calendar. The lunar month lasts 29.5 days. A new moon is born when it becomes perpendicular between the sun and the earth. At that point, called ‘conjunction’, the moon is completely invisible to us because all of the sun’s radiation is reflected back by the moon and none reaches the earth.  The time passed after the moment of conjunction is called the age of the moon. Once the moon is visible, the month of Ramadan is declared.

A new moon: the first crescent after conjunction

Wrong sighting:

The crescent sets before the sun

True sighting:

The crescent sets after the sun