Prayer times look simple on a screen: five names, five times, one moving highlight. Underneath, they are a compact problem in astronomy, geography, time zones, and regional convention.
Most software solves that problem by sending a location to an online service and accepting whatever comes back. Noorani takes a different route. The browser calculates the schedule on your device. Your location is an input to a local calculation, not a request sent across the internet.
Local prayer times start with the sun
The daily schedule is tied to the position of the sun. That position changes with the date, latitude, and longitude. Solar noon, sunrise, sunset, and the twilight periods around them provide the astronomical structure from which prayer times are derived.
This is why copying a fixed timetable from another city does not work well. Move east or west and solar noon shifts. Move north or south and the length of twilight changes, sometimes sharply across the year.
The underlying concepts are established rather than proprietary. The NOAA Solar Calculator glossary explains terms such as solar noon, equation of time, declination, and atmospheric refraction. The calculation engine turns those kinds of solar values into useful clock times for a particular place and day.
What Noorani needs—and what it does not
To calculate a schedule, Noorani needs three practical inputs: your approximate coordinates, the current date, and your time zone. It also needs your chosen calculation method.
It does not need an account. It does not need a history of where you have been. It does not need to ask a Noorani server for today's answer.
Location remains sensitive even when an app has a reasonable use for it. The W3C Geolocation specification treats geolocation as a powerful feature and recommends clear permission controls, limited permission lifetimes, and easy revocation. Our design starts from the same basic idea: access should be visible, narrow, and connected to a feature the user asked for.
[INTERNAL LINK TO: Noorani privacy architecture overview]
Why calculation methods produce different results
Two trustworthy prayer timetables can disagree by a few minutes without either being broken. The usual source is the calculation method.
Fajr and Isha depend on how twilight is defined. Different authorities use different solar angles or, in some cases, a fixed interval after sunset for Isha. Asr can also vary according to the selected juristic convention. High-latitude locations need additional handling when twilight behaves differently from places closer to the equator.
Noorani v1 supports six calculation methods: Karachi, ISNA, Muslim World League, Umm al-Qura, Egyptian General Authority, and Kuwait. The point is not to declare one global default “correct” for everyone. The point is to let users match the convention followed by their region or local community.
The PrayTimes manual offers a useful technical view of these parameters, including twilight angles, Asr shadow factors, fixed intervals, and high-latitude adjustments.
A practical way to choose
Start with the method commonly used by your local mosque or national religious authority. Compare Noorani's schedule with a timetable you already trust for several days, not just one. If Fajr or Isha consistently differs, check the selected method before adding manual offsets.
That is the concrete takeaway: treat the calculation method as a regional setting, much like a time zone. A familiar method will usually matter more than chasing a universal setting that does not exist.
The calculation stays on your computer
Once Noorani has the inputs, the prayer-time engine runs locally. It computes the relevant solar positions, applies the selected method, converts the results into local clock time, and prepares the day's schedule for the browser interface.
No server call is required for that calculation. The design has two immediate benefits.
First, it reduces data exposure. A remote prayer-time API does not need to receive your coordinates each time the schedule refreshes. Avoiding a transfer is stronger than promising to handle the transferred data carefully.
Second, it works offline. A lost connection should not make a daily schedule disappear. Once Noorani knows the settings it needs, the same local engine can continue producing results.
Local-first does not mean location-free. Coordinates still exist on the device, and operating-system or browser permissions still matter. It means the feature can do its job without turning those coordinates into routine network traffic.
[INTERNAL LINK TO: why Noorani blocks trackers by default]
Accuracy means showing the choices
A prayer-time interface can look precise while hiding important assumptions. “5:12” appears definitive, but it depends on a location, a method, a time zone, daylight-saving rules, and rounding.
Good product design makes those choices inspectable. Noorani lets users select the calculation method that fits their context. The engine supports local computation, but the interface still has to explain enough for a person to understand why a time may differ from a printed mosque timetable.
This is especially important for travelers and people living at high latitudes. A setting that matches Islamabad may not be the best match in Oslo. The calculation is global; the convention is local.
[INTERNAL LINK TO: configuring prayer times in Noorani]
Why this belongs inside the browser
Prayer times shape the day, but checking them should not require another account, another dashboard, or another stream of notifications. A browser already sits at the center of daily computer use. The useful information can be present without demanding attention.
That is the product principle behind Noorani's implementation: compute quietly, expose the settings, and keep the data path short. The result is not a web service disguised as a browser feature. It is a browser capability that continues to work even when the network does not.
Browse with more intention
Noorani brings prayer times, Qibla, tracker blocking, and privacy into one calm desktop browser built for how Muslims live online.