What archaeological evidence supports the 483-year count in Daniel's prophecy?

Les explains that chronologists and archaeologists have teamed up and actually found the decree that Daniel mentions, the one giving the Jews permission to return after Nebuchadnezzar destroyed their temple. That decree was dated, and Les says it was March 14, 445 B.C.; from that date to Palm Sunday was exactly 483 years, so that part was fulfilled. He notes that although God's timetable for Israel was 490 years leading to the rejection of the Messiah, only 483 years were fulfilled at Christ's first coming. The remaining seven years were not fulfilled then, and the prophecy's 490 years still had a final seven-year period. Bible scholars therefore sometimes call the Tribulation Daniel's 70th week. Sixty-nine of them were fulfilled at the cross, but the 70th week, the final seven years, is still unfulfilled and has been pushed into the future. Les also points out that the part about bringing in everlasting righteousness, sealing up the vision and prophecy, and anointing the most holy has not yet happened; it will happen when Christ returns and sets up His kingdom, not at His first coming.