Cain and Abel
The full story of Cain and Abel can be found here. For the sake of brevity, Cain and Abel were brothers, the only two children of Adam and Eve. Both made sacrifices to God; Cain offered what he grew and Abel offered the firstborn from his flock. As Cain began to see God showing more favor towards Abel, he got angry. When God noticed, he advised Cain to master his desires; which Cain did by murdering Abel. For that, God cursed him and sent him away. When Cain pleaded for mercy, God put a mark on him to protect him. Cain left Eden for the land of Nod, found a wife, built a city and and lived happily ever after.
15"Not so! If any one slays Cain, vengeance shall be taken on him sevenfold." (Gen. 4:15)
1617 (Gen. 4:16-17)
The legend takes place when the sun is in Scorpio. Hercules personifies Abel, and Ophiuchus personifies Cain. There are two reasons why we know Ophiuchus personifies Cain. First, he is holding a snake. Second, his head is represented by only one star, which would be the Mark of Cain. (I’ve highlighted Ras Alhague with a yellow dot.) On a scale of -1 to 19, with -1 being the brightest, Ras Alhague has a magnitude of 2.1. That's easily visible and close in magnitude to the North Star Polaris.
As for Abel, we see him upside down as the slain brother lying on his back. (We can ignore the apples and club in his hands; that comes from the Hercules myth.) Libra represents the the justice mete out to Cain after Abel's murder. As the sun drifts toward Virgo, Cain fades away and we see Cain's wife, Virgo.
I'm going to take a guess at what "east of Eden" means with regard to the whereabouts of the land of Nod: As the days pass, the stars drift towards the west until they set in the west. A few months later they rise in the east again. So to ancients, the west symbolizes death and east symbolizes life. It means Nod is extant. The evil Cain symbolizes the enemies of the Hebrews, perhaps Babylon.