The Sun as black as sackcloth is the solar eclipes of the first day of Virgo

When the sun moves from one sign of the zodiac to another, it is the equivalent to "opening a seal" in the Book of Revelations. The movement of the Sun from Leo to Virgo, the sixth month, and the sunset is described as follows:

Revelation 6:12

And I beheld when he had opened the sixth seal, and, lo, there was a great earthquake; and the sun became black as sackcloth of hair, and the moon became as blood;

Will there be a great earthquake tomorrow?

The first verse of Revelations 6:1 clearly describes the first seal as the first month, Aires the Ram(Lamb), the sunrise.

Revelation 6

6 And I saw when the Lamb opened one of the seals, and I heard, as it were the noise of thunder, one of the four beasts saying, Come and see.

² And I saw, and behold a white horse: and he that sat on him had a bow; and a crown was given unto him: and he went forth conquering, and to conquer.

The crown that is given is the sun