There are no bulls in the Gospels, nor are there any crabs, lions, or scorpions. We do find a bull and lion in Revelations 4:7, "and the first living creature like a lion, and the second living creature like a calf, and the third living creature having the face as of a man, and the fourth living creature like a flying eagle." This is a reference to the four seasons of the year. The lion is Leo, the calf is Taurus, the man is Aquarius, and the eagle is one of the three symbols for Scorpio (see Saint Matthew: a sermon by Robert Taylor - 1831)
Instead we need to look at what changes happen around this time of year
and compare that to what happens in the Jesus story.