Heliolongitude distribution of the GLE sources on the solar disk for the events registered in 1956–1991 (Shea & Smart, 1993, black circles), together with the author’s addition (Miroshnichenko, 2014) for the events observed before 1956 and after 1991 (open circles). In total 70 GLEs from ground-based observations are presented here during the time interval 1942–2006. The “East-West” rotation of the Sun is indicated by a curved arrow and the direction towards the Earth by a straight arrow.