Luke arranged these unusual occurrences to show God"s displeasure with humankind for rejecting His Son. [1] The sixth and ninth hours were noon and3:00 p.m. respectively. Darkness obscuring the sun represented judgment obscuring the beneficent light of God"s countenance (cf. Isaiah 5:30; Isaiah 60:2; Joel 2:30-31; Amos 5:18; Amos 5:20; Zephaniah 1:14-18; Luke 22:53; Acts 2:20; 2 Peter 2:17; Revelation 6:12-17). Evidently this was a local rather than a universal phenomenon. It could not have been a solar eclipse since Passover occurred at the full moon. [source][source][source]
Luke moved the tearing of the temple veil up in his narrative whereas Matthew and Mark placed it after Jesus" death as a consequence of that event. It symbolizes the opening of the way into God"s presence that Jesus" death effected in those Gospels. However in Luke the reader sees it as a sign of God"s wrath. Specifically it seems to represent God"s judgment on Judaism for rejecting the Messiah. It was a portent of the judgment coming on Jerusalem that Jesus had predicted. [source][source][source]