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Institute of Geophysics, University of Tehran calculation method
Fajr at 17.7° below the horizon, Isha at 14°. Published by the Institute of Geophysics at the University of Tehran, with 17.7° for Fajr, 14° for Isha and a Maghrib defined by a 4.5° sun angle, used in Iran.
Parameters
| Parameter | Value |
|---|---|
| Fajr | 17.7° below the horizon |
| Isha | 14° |
| Maghrib | 4.5° below the horizon |
| Asr | Shafi (1x shadow) or Hanafi (2x), your choice in Settings |
This method adds no built-in minute offsets.
Where it is used
Published by the Institute of Geophysics at the University of Tehran, with 17.7° for Fajr, 14° for Isha and a Maghrib defined by a 4.5° sun angle, used in Iran. Your local mosque may publish its own table, so use this as a guide and check it against theirs.
Example times
Computed with this method for the spring equinox 2027 (20 March), the same engine as the app:
| City (spring equinox 2027) | Fajr | Isha |
|---|---|---|
| Mecca | 05:13 | 19:28 |
| London | 04:23 | 19:39 |
| Kyiv | 04:20 | 19:34 |
Values for Kyiv and London apply the high-latitude rule recommended for latitudes above 48°.
Use it in Sakina
Open the app, then Settings, then Method, and pick Institute of Geophysics, University of Tehran. You can nudge each prayer by a few minutes to match your local timetable.
Compare with other methods
Frequently asked questions
Who decides the Institute of Geophysics, University of Tehran angles?
Published by the Institute of Geophysics at the University of Tehran, with 17. The angles are published parameters, not measurements.