Some notes I jotted down from the video posted above:

We should not be surprised that the sun, moon and stars are what the Prophets and our Lord use to reveal to us concerning the day of His return.

Daniel 12:9
And he said, Go your way, Daniel: for the words are closed up and sealed till the time of the end.

Are we now at the time of the end?

Daniel 12:4
But you, O Daniel, shut up the words, and seal the book, even to the time of the end: many shall run to and fro, and knowledge shall be increased.

What knowledge shall increase?

Hosea 4:6
My people are destroyed for lack of knowledge: because you have rejected knowledge, I will also reject you, that you shall be no priest to me:
because you have forgotten the law of your God, I will also forget your children.

Knowledge of the law of God which is to increase before the day of the Lord, makes His people wise.

This is why Daniel is told, regarding the day of the Lord, the day Yeshua returns and resurrects His people, Daniel 12:9:
And he said, Go your way, Daniel: for the words are closed up and sealed till the time of the end.

The reason is that knowledge needs to increase, knowledge about the law of God, thereby making the people wise and able to discern the times.