Prayer: How Should One Face the Qiblah from the Antipode of the Kaʿbah?

Practical Laws of Islam as per the teachings of Imam Khamenei

Prayer: How Should One Face the Qiblah from the Antipode of the Kaʿbah?

English:

Question #365:

How should one face the qiblah at the point which is the opposite to the Holy Ka‘bah on the other side of the earth so that the line drawn from the Holy Ka‘bah passing through the center of the earth comes out of the other side of the earth at this point?

Answer #365:

The basis in facing the qiblah is to turn towards the Free House [Ka‘bah] in such a manner that someone who stands on the surface of the earth faces the Holy Ka‘bah that is built upon the earth’s surface in Mecca. Therefore, if one stands at a point on the earth where the straight lines emanating from it in four directions and passing over the earth’s surface towards the Holy Ka‘bah are equal in distance, he can pray to any direction he wishes. But, if the distance in some directions is shorter to the extent that the realisation of facing qiblah varies according to common view, it will be obligatory to choose the direction of the shorter distance.

-Imam Khamenei, Practical Laws of Islam, Importance and Conditions of Prayer