Darkness over all the Land
Mark 15:33 And when the sixth hour was come, there was darkness over the whole land until the ninth hour.
The sixth hour by Hebrew time was 12 noon. At the brightest time of day until 3PM, there was darkness over the whole land. All Israel was in darkness because of this great sin against God's Son, who is the Light of the world.
Jesus had spoken earlier:
John 12:35 Then Jesus said unto them, Yet a little while is the light with you. Walk while ye have the light, lest darkness come upon you: for he that walketh in darkness knoweth not whither he goeth.
John 12:36 While ye have light, believe in the light, that ye may be the children of light. These things spake Jesus, ...
Mark 15:34 And at the ninth hour Jesus cried with a loud voice, saying, Eloi, Eloi, lama sabachthani? which is, being interpreted, My God, my God, why hast thou forsaken me?
For the first time, Jesus felt separated from the Father. This was because he took upon himself our sins. Sins separate us from the Father. Jesus took our sins upon himself.
Gal 1:4 Who gave himself for our sins, that he might deliver us from this present evil world, according to the will of God and our Father:
Gal 1:5 To whom be glory for ever and ever. Amen.
Mark 15:35 And some of them that stood by, when they heard it, said, Behold, he calleth Elias.
Mark 15:36 And one ran and filled a sponge full of vinegar, and put it on a reed, and gave him to drink, saying, Let alone; let us see whether Elias will come to take him down.
Elias had come, John the Baptist; And, they killed him too.
Mat 11:13 For all the prophets and the law prophesied until John.
Mat 11:14 And if ye will receive it, this is Elias, which was for to come.
Mat 11:15 He that hath ears to hear, let him hear.