i know you are talking about Ijtihaad in Islam…Ijtihaad has to be in light of Qur’aan N aHaadees…Ijtihaad does NOT equate to COMPROMISES!..
according to Qur’aan…fasting has to be observed between DAWN and SUNSET!..PERIOD!
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If there is no distinction between day and night then there is an Ijmaa among ulemaa~ that you can follow saum timings to the nearest place where there is this distinction evident.**