This new interpretation (System C) was built under the heavy influence of the Talmudists (spiritual offshoots of the Pharisees). It flourished primarily among the Karaites and neo (later)-Samaritans but was also practiced by some less well-known groups.
The Aristocratic understanding (System A) of “בין חערבים (byn ha-arabim)” was represented by the Jews called Sadducees, the Boethusian Sadducees, and by the ancient Samaritans.
Moreover, the Aristocratic practice was utilized by Yahushua the messiah, his apostles, and the early assemblies that followed him.1
Very few writings which discuss just how to observe Passover have come down to us directly from any acknowledged Sadducean, Boethusian, or ancient Samaritan source. So, for an acquaintance with their opinions, we are mainly dependent upon their antagonists.2
These antagonists, and records which are derived from the later variations of this view (as demonstrated by the neo-Samaritans and Karaites),3 show that, contrary to the Hasidic views, the Aristocratic approach understood that the first ערב (arab; intermixing of light and dark) occurred at sunset and the second at deep twilight (the setting of darkness).