Work is underway to establish an on-line automatic Fajr and Isha calculating function based on the finding of this project. If you wish to bring your prayer timetables closer inline with modern studies and calculation methods then the following can be implemented for Fajr and Isha in the interim.
if you would like more information about creating your own timetable or would like support then please contact the TaybaTrust.
Fajr
All locations below 48.5° latitude (Majority of the Islamic World) –
Dawn can be calculated at the sun depression angle of 14.5° for the complete year without the need for any adjustments of alternative calculations as the sun always goes below 18°.
The required times can be produced using the on-line Websurf 2.0 functions from the Royal Nautical Almanac Office.
Use the 'Rise, Set and Twilight Times' option with the depression angle of 14 degrees and 30 minutes for the complete year to give you the calculated Fajr times.
All Locations above 48.5° latitude –
The required times can be produced using the on-line Websurf 2.0 functions from the Royal Nautical Almanac Office.
Use the 'Rise, Set and Twilight Times' option with the depression angle of 18 degrees for the complete year. Note the last day before the results show ** [Alternative Start] and the first day after period where ** is shown [Alternative End].
For the dates which did not show **, re-run the 'Rise, Set and Twilight Times' option using the depression angle of 14 degrees and 30 minutes which will give you the calculated Fajr times for the year-start to [Alternative Start] and [Alternative End] to year-end.
At the last date, where the sun reached 18° [Alternative Start], calculate the difference in minutes between the started Fajr time (at 14.5°) and sunrise. Substract this time difference (in minute) from sunrise for all days until you reach [Alternative End]. This will give you the adjusted Fajr time for the summer months.
Isha
There is more flexibility in establishing the time for Isha.
Option 1 : Shafaq al-Abyad (When the white light has been replaced with total darkness)
All locations below 48.5° latitude (Majority of the Islamic World) –
Isha can be calculated at the sun depression angle of 14.5° for the complete year without the need for any adjustments of alternative calculations as the sun always goes below 18°.
The required times can be produced using the on-line Websurf 2.0 functions from the Royal Nautical Almanac Office.
Use the 'Rise, Set and Twilight Times' option with the depression angle of 14 degrees and 30 minutes for the complete year to give you the calculated Isha times.
All Locations above 48.5° latitude –
The required times can be produced using the on-line Websurf 2.0 functions from the Royal Nautical Almanac Office.
Use the 'Rise, Set and Twilight Times' option with the depression angle of 18 degrees for the complete year. Note the last day before the results show ** [Alternative Start] and the first day after period where ** is shown [Alternative End].
For the dates which did not show **, re-run the 'Rise, Set and Twilight Times' option using the depression angle of 14 degrees and 30 minutes which will give you the calculated Isha times for the year-start to [Alternative Start] and [Alternative End] to year-end.
At the last date, where the sun reached 18° [Alternative Start], calculate the difference in minutes between the started Isha time (at 14.5°) and sunset. Add this time difference (in minute) to sunset for all days until you reach [Alternative End]. This will give you the adjusted Isha time for the summer months.
Option 2: Ensure at least Shafaq al-Ammar (When the red light after sunset has been replaced with only white light) is met
In locations (latitudes) where Shafaq al-Abyad is established very late in the night for the summer months (using option 1 above), an alternative can be used where all red and the majority of white light has diminished.
The required times can be produced using the on-line Websurf 2.0 functions from the Royal Nautical Almanac Office.
Use the 'Rise, Set and Twilight Times' option with the depression angle of 14 degrees and 30 minutes for the complete year to give you the calculated Isha times. Where the difference in minutes between sunset and the stated Isha time is greater than 90 minutes then keep this gap between sunset and Isha ensuring that the resulting time is not below the Isha time which could be calculated at a sun depression angle of 8°
Option 3 : Use the function provided by moonsighting.com