The five daily times and the direction, the Hijri calendar, the two times that matter in Ramadan, the once-a-year zakat, and the ingredient check you do at the supermarket — gathered as one bundle.
A Muslim day is divided by where the sun is, not by the hour. Fajr, Dhuhr, Asr, Maghrib and Isha — and three of those are pinned to something you can see: the sun crossing its highest point, a shadow reaching a length, the disc dropping below the horizon.
The other two cannot be. Fajr and Isha are defined by twilight, and twilight is a glow rather than an event, so it is translated into geometry: how many degrees the sun has sunk below the horizon. Different institutions chose different angles, and that single choice is why two apps in the same city disagree.
The one thing worth doing once is matching the calculation method to the timetable your mosque prints. If Fajr lines up within a minute or two you are done. If Asr is a full hour out, that is not the method — it is the madhhab setting, which is a different switch.
Then leave it alone. Re-picking a method every month is how people end up praying to three different schedules in the same year.
The qibla is not a straight line on a flat map; it is the shortest route across a sphere. That bearing can differ sharply from what a flat map suggests, and the further you are from Makkah the larger the gap.
On top of that, the north your phone's compass points at is magnetic north, which is not true north. The offset varies by location and exceeds ten degrees in some places.
So read the bearing first and align the room to that number, rather than trusting the needle alone. Indoors, metal and electronics pull a compass around — walk to a window and take it again, and you will often see the reading move.
The Hijri calendar is lunar, so a year runs about 354 days. That is roughly eleven days shorter than the Gregorian year, which is why the same Islamic date arrives eleven days earlier each year.
Guessing this year from last year's month therefore drifts. After about thirty-three years the cycle comes back around to where it started.
What actually bites in practice is that every anniversary exists twice — once on each calendar — and the two separate a little more every year. The zakat due date works the same way: anchor your hawl to a Gregorian date and it slips eleven days annually against the Islamic one.
For a month, only two times matter: Fajr, which closes suhoor and opens the fast, and Maghrib, which breaks it.
Maghrib is a sunset you can watch, so every method agrees on it. The disagreement is always at the Fajr end, and depending on the method it can span more than twenty minutes — twenty minutes of eating, which is why the choice of method has a real consequence here rather than a theoretical one.
At high latitudes the geometry breaks outright: in a northern European summer the sun never sinks far enough for twilight to end, so the angle has no solution. No app is authoritative there. Your regional Islamic council has almost certainly ruled on exactly those weeks, and that ruling beats any calculator.
Almost nobody disputes the rate of 2.5%. The argument is about the threshold: whether nisab is the value of 85 grams of gold or of 595 grams of silver, a difference of more than tenfold.
The two weights were meant to be equivalent. In the Prophet's time gold and silver traded at roughly one to seven, and 595 divided by 85 is exactly seven. Silver then lost its monetary role, the ratio widened toward one to eighty or ninety, and because the formula never changed the two thresholds drifted apart.
The working order is: subtract the debts actually due now from your assets, check whether the remainder clears the threshold, and pay 2.5% if it does. Deducting the entire outstanding balance of a long-term loan rather than the instalments due this year is the most common error.
The year is a lunar hawl. Payers who prefer to keep a Gregorian schedule are commonly advised to use 2.577% instead — 2.5% scaled by 365 over 354.
In packaged food the problem is rarely the meat itself; it is additives and processing aids — gelatine, emulsifiers, some enzymes, the solvents that carry flavourings.
When an ingredient appears only as a numeric code, the name alone does not tell you whether the source was animal or plant. Some codes are produced from either, so the honest classification for those is not «fine» but «needs checking».
Alcohol splits the same way. Drinking alcohol and the trace ethanol left behind by a flavour solvent are judged differently by different bodies, so checking your own institution's position once saves you from re-deciding at every shelf.