A common Legend says that this is a blessing of Shiva to the Lunar God 'Chandra' > WHY SHIVA WEARS A CRESCENT MOON Daksha's curse on Chandra is the reason Twentyseven of Daksha's daughters were married to the moon god Chandra. read more
Thus being the graceful Almighty, Lord Shiva wore the moon crescent on His head, making him grow for 15 days and decay for 15 days periodically. Chandra was delighted. The linga to which Chandra prayed is Somanatha, the first of the jyotirlingas. read more