In Edmonton, Canada, during certain months, with the absence of the signs for Fajr and Isha, is the time for both Fajr and Isha estimated, or only Fajr? And how is the estimation done when measuring by analogy with the closest city where the signs are distinguishable? Are there different permissible estimation methods? And if the time is estimated proportionally, such as using midnight for the entry of Isha time, how is the night originally calculated without a sign for Fajr?

As long as the red twilight (shafaq al-ahmar) is visible, it must be relied upon as the time for the entry of Isha (night prayer), and it is not permissible to deviate from it to estimation. Rather, what is estimated for it is Fajr (dawn prayer) in places where the day is exceptionally long. The time for Fajr in these cases is estimated by analogy with the nearest countries where night and day occur naturally, or by using the moderate time (12 hours for each of night and day), and the preponderant opinion is estimation by the nearest country. To calculate Fajr in such circumstances, one can calculate the proportion of Fajr's share (from Fajr to sunrise) in a known country, and then apply this proportion to the period between Maghrib (sunset) and sunrise in the country in question.