ISB ~ Mark 15 v33

sixth hour … ninth hour:i.e., from noon until 3 P.M. Luke’s account may suggest that the darkness was caused by an extended solar eclipse (Lk 23:45).

• The OT associates such dreadful darkness with divine judgment on sin (Ex 10:21-23; Is 13:10-11; Amos 8:9). See note on Mt 27:45.