The main reason for the second day Yom Tov is because in the times of the Beis Hamikdash when we decided to declare months based on the seeing the new moon there where certain places that the ...
Can someone living outside of Israel ask a visitor from Israel to do a melacha for them on the second day of Yom Tov if the visiting Israeli is only keeping one day of Yom Tov?
Why do we continue to keep two days of Yom Tov outside of Israel? The reason for two days was revelant during the temple era as we needed two witnesses to see the new moon. But today, with no Temple ...