Summary of recurrent Imsak/Fajr calendar problems

Every year, Muslims in Europe, USA and elsewhere in the world, were periodically facing recurrent problems upon choosing individually their applicable abstinence (imsak) time during the holy month of blessed Ramadan. Issues were even more critical over some seasons and geographical locations, since time ambiguity could be as high as 120 minutes. The main reason of this loose situation was related to the fact that imsak times presented in various timetables were not genuine but arbitrarily fixed within the astronomical twilight limits, based on sun depression angle ranging between 12 and 18 or even 20 degrees in some countries. Moreover, all the imsak/fadjr computing methods currently available in smartphone applications, which were driven by Egyptian General Authority of Survey, Islamic Society of North America (ISNA), Muslim World Leahue (MWL), Umm al-Qura University in Makkah, University of Islamic Sciences in Karachi, and some others, were only adding more confusion to the problem, since they were all based on wrong sun-depression parameter-fixing methodology, let alone that they were not taking into account the higher latitudes specific to northern european countries. Consequently, western residents and travellers using such applications were getting into harmful confusion to selecting the appropriate settings method. 

Fortunately, the recent experimental observations that were made in near-sky Lausanne, CH, on June 23, 2016, in which evidence of the missing stone driving the determination of the accurate imsak/fajr signal (locally, within 10 seconds error) was discovered by serendipity, opened up new issues to providing muslims with a sustainable (mathematical) solution to the problem, in full agreement with the scriptural texts. Therefore, in a pilot study, this gold standard measurement point was successfully used to setting out for the first time ever, unique and accurate manned-independent imsak/fajr timesets applicable to the city of Lausanne, CH, over May-July pilot period, that we disclose on this site.

We summarize in  this link, the main issues of this finding and present the accurate imsak/fajr timetables with 99% confidence interval (standard error: 1'), along with the equivalent adjusted sun-depression angles.


Cautious: Reader must be aware that those timesets are only applicable to city of Lausanne for May-July period. Additional work will be carried away to providing Imsak/Fajr calendars over the whole gregorian year in all countries. Timesets releasing models applicable worldwide will be set on due time.