Tehran and Qum calculation methods, compared

Shia prayer-time services commonly offer a profile associated with the Institute of Geophysics at the University of Tehran, and one associated with the Leva Research Institute in Qum.

The differences are parameter-level: the depression angles used for dawn and night, and the handling of the interval after sunset. Small angle differences produce differences of minutes, and those differences grow at higher latitudes.

Use the method your community or marja follows. If you do not know, compare a locally reviewed timetable with each profile and choose the one that matches.

We will publish the exact angles for each profile once they can be cited to the provider's own documentation. Quoting parameters from memory is how inaccurate timetables spread.

This is an educational summary drafted editorially and awaiting scholarly review. It is not a personal religious ruling; your marja's guidance and your local religious authority take precedence.