1.
Marcus Abisror asks:
can i get an understandble explanation on rabeinu tam shita of tzies and shkia, and those who argue on him. basically the whole deal with shkia, bein hashmashot, and tzeis hacochavim.
Marcus Abisror, Long Branch
2.
The Kollel replies:
You should find most of what you are looking for in the Shiur I gave in English for Chanukah 5783.
You can find a clear summary in Hebrew, with all of the sources that I quoted, over here https://www.dafyomi.co.il/lectures/marei-chanukahmailing5783.pdf
Best regards, Rabbi Mordecai Kornfeld