• Runs on every platform, OS-independent, no installation
  • Displays real-time or historical data between 1901 and 2099
  • All timings by truly astronomical calculation
  • 6 different timing calculation algorithms
  • Parametric depression angles and safety margins
  • Enter latitude/longitude manually with any resolution
  • Can use real-location information (GPS)
  • Moving map support
  • All prayer and makrouh times, Hanafi and Shafi Asr calculation, Qibla Time
  • Crescent visibility and hijri calendar with 5 distinct sighting criteria
  • High Altitude Correction
  • Reminds Holy Days
  • Azimuth/elevation angles for sun/moon & Qibla angle with graphical display
  • Real-time/real-location direction-guidance under GPS support
  • Graphical display of sun/moon trajectory
  • Real-time display of earth/moon view
  • Real-time earth illumination map showing all prayer/makrouh zones
  • Latitude/longitude display support for the map
  • Notifies sun/moon eclipses
  • Some astronomical values in real-time
  • Dashboard shows navigational data from GPS (speed, acceleration, altitude, inclination, direction & distance)
  • Also runs off-line (airplane mode)


EVKAT is an HTML/JS application which can be accessed by the WEB browser of any device to obtain the prayer/makrouh timings and other related astronomical data (JavaScript must be enabled).

The left column of the Astronomical Data section on the form shows all the prayer/makrouh timings together with the qibla time and sun/qibla angles. The right column displays other astronomical information which you may need less frequently. Click here for detailed information about the definition and calculation of the timings and other data.


You can change the application parameters using the Settings section. The Real-Time box will be checked when the form is loaded the first time. The system clock of your device is used in this case and all the data & graphics are updated in real-time. If you want to make analysis for some specific date/time in the past or future, uncheck this box. Then the Date-Time field becomes active such that you can obtain data & graphics for the entered date/time. You can change the date and time over a pop-up calendar or by up-down buttons (depending on your browser) on this field. Enter the coordinates (in degrees) of your location onto the Latitude and Longitude fields (north/east positive). If the Map box is checked, the 'Google Map' will be loaded and displayed, based on the latitude/longitude. An internet connection will be necessary for the map. The zoom level can be adjusted by the slider bar. When the Real-Location box is checked, the instantaneous GPS data will be used (this feature must be available on your device and access to the location data must be allowed). The latitude/longitude fields, the map and all data/graphics are then automatically updated according to the actual GPS data. Furthermore, the current speed/heading/altitude values (if available) and the accuracy are displayed. The latitude/longitude fields are disabled and the coordinates cannot be entered manually when this box is checked. GPS is generally functional even in Airplane Mode, thereby ensuring reliable data during any expedition (airplane/ship/train). The System TZ box will be checked when the form is loaded the first time. The time zone value of your device OS will be used in this case. To set a different time zone, uncheck this box and activate the Time Zone field. Then enter the desired time zone value into this field manually (east positive). The remaining fields hold the calculation criteria regarding the prayer/makrouh timings and the hijri date.


Five distinct graphs can be displayed simultaneously on the Graphics section of the form. Each of the graphs may be activated by checking its box. The Angles graph shows the true north azimuth angle of the sun/moon/qibla and also the elevation angle of the sun & moon with respect to the horizon, thereby helping you to find the direction. The azimuth angles become dashed and they rotate accordingly if GPS heading data is present. If you then hold your device horizontally in the direction of your movement, you can directly see the real qibla angle, along with the north/sun/moon angles (compass feature). The Moon View graph displays the topocentric appearance of the moon. Several measures such as tilt angle adjustment, earthshine & shadowing, refracted color correction, are applied for a realistic view. The background sky illumination can be toggled on-off by clicking on the graphic. When the moon is under horizon; only the sky will appear with illumination-on, or the moon with extra-atmospheric color is displayed with illumination-off. The Trajectories graph draws the 3D sun/moon trajectory over the sky throughout the day. The Earth Globe View graph shows the ecliptic view of the earth, including twilight zones. The World Prayer Timings graph sketches all prayer/makrouh timings on the earth map. Fajr/Sunset zones are painted in blue, makrouh regions in orange, Isha in gray. Mid-day time is drawn in violet, Zuhr in white, Asr-I in light-green and Asr-II in dark-green. Your current location is presented as a tiny red dot. If you move on the map with the pointer, you can also read the related latitude & longitude values.


The Dashboard section pops automatically if the Real-Location box is checked and the GPS data is available. Dynamic motion info can be tracked over the virtual analog displays. The big display at the center shows the speed and the distance travelled, whereas the upper-left and lower-left displays show the altitude (a.s.l.) and the inclination, respectively. The upper-right display is the compass and the lower-right is the longitudinal/radial accelerometer. The lower-left LED flashes each time the GPS data is updated, whereas the lower-right LED changes color according to the GPS quality level.


The application EVKAT does not need any internet connection as long as it remains open. It has also been designed such that it can be re-opened from the cache of the browser if there is no internet connection. However, some browsers (e.g. Chrome) may require a connection to open the application. If you absolutely need to use EVKAT without internet, you may open 'evkat_en.txt', download it to the local drive of your mobile device and then rename it as 'evkat_en.htm'. Alternatively, you may right-click to the application link, save the file 'evkat_en.htm' to your PC and transfer the file to your mobile device (via USB or Bluetooth). If you write the full name of the file onto the address bar of the browser (e.g. "file:///storage/emulated/0/Download/evkat_en.htm"), the application EVKAT will open & run off-line. You may add EVKAT to Favorites tab of your browser for subsequent access. The off-line usage of EVKAT is also beneficial since some browsers deny to access 'Real-Location' data without a secure connection.


Click to go to the EVKAT application