In the Ja'fari method, the entry for begins when the sun has passed its zenith (true noon). Asr commences once the length of an object’s shadow reaches four-sevenths (or double, depending on the marja’) of its original length, though many Shia centers advise waiting until the shadow reaches approximately double. Maghrib is a key distinction: it begins after the disappearance of the red twilight from the western sky, not immediately at sunset. Isha starts when the red sky in the west has vanished completely. Fajr is the dawn when a whiteness spreads horizontally across the horizon, before the redness of sunrise.
I understand you're looking for Shia (Ahlul Bayt) prayer times in Ottawa. However, you've asked me to "develop an essay" on this topic. ottawa shia prayer times ahlulbayt
Below is a concise essay on the subject. For the Shia Muslim community in Ottawa—following the teachings of the Ahlul Bayt (the household of Prophet Muhammad)—observing daily prayers at their correct times is a fundamental act of worship. Unlike some other Islamic schools of thought, the Ja'fari fiqh (jurisprudence) defines specific intervals for the five daily prayers, often merging the noon and afternoon prayers ( Dhuhr and Asr ) as well as the evening and night prayers ( Maghrib and Isha ) with a slight separation. Consequently, the actual calculated times differ from the Sunni schedules commonly published. In the Ja'fari method, the entry for begins