Prayer Times
Independent, real-time calculation matching The Prayer Center’s published schedule: 15° Fajr, Hanafi Asr, solar-noon Dhuhr, sunset Maghrib, and 15° Isha.
- Prayer Center location
- 41.589649° N, 87.872240° W
- Schedule profile
- 41.6163° N, 87.8371° W
- Clock and rounding
- America/Chicago · Nearest minute
Calculating --:--
Loading the Orland Park clock…
Orland Park prayer calendar
| Day | Fajr | Sunrise | Dhuhr | Asr | Maghrib | Isha |
|---|---|---|---|---|---|---|
| Calculating this month… | ||||||
Today · Friday is marked for Jumu’ah. These are prayer-beginning times, not congregation iqamah times.
The profile behind the published table
The July pattern is not a list of hand-entered offsets. It is a coherent solar model, and the same model continues to match the available winter and spring schedules.
- Prayer Center coordinates
- 41.589649, -87.872240
- Effective schedule coordinates
- 41.6163, -87.8371
- Fajr
- Sun at −15° altitude
- Sunrise
- Sun at −0.833° altitude
- Dhuhr
- Unadjusted solar transit
- Asr
- Hanafi shadow factor 2
- Maghrib
- Sunset at −0.833° altitude
- Isha
- Sun at −15° altitude
- Time zone
- America/Chicago with DST
Two coordinates, two purposes. The Prayer Center of Orland Park, also known as Orland Park Prayer Center, is saved at 41.589649, -87.872240. The calculator preserves the separate effective city coordinate used by the published schedule because calculating directly at the building can change some rounded dates by a minute.
From solar geometry to clock time
Prayer times are not found by optimizing equal portions of the day. Each time is tied to a solar event or shadow condition. The calculator first obtains the sun’s declination and the equation of time for the date, then solves the corresponding hour angle.
D = 12 + Z − λ/15 − E
D is local solar transit in clock hours, Z is the local UTC offset, λ is east-positive longitude, and E is the equation of time in hours. Chicago’s Z changes automatically between CST and CDT.
H(h) = arccos[(sin h − sin φ sin δ) / (cos φ cos δ)]
φ is latitude and δ is the sun’s declination. Dividing H by 15 converts degrees of solar rotation into hours before or after transit.
D − H(−15°)/15D − H(−0.833°)/15DD + H(−0.833°)/15D + H(−15°)/15hₐ = arctan[1 / (2 + tan|φ − δ|)]
Asr = D + H(hₐ)/15
At solar noon an object already has a shadow of tan|φ − δ| times its height. Hanafi Asr begins when the additional shadow reaches twice the object’s height, which produces the altitude hₐ.
The table is symmetric around solar noon.
Fajr 3:39 and Isha 10:11 have a midpoint of 12:55. Sunrise 5:21 and Maghrib 8:29 also have a midpoint of 12:55. Equal morning and evening intervals point to equal 15° twilight angles; the late 6:11 Asr fits the Hanafi factor of 2. The changing intervals through July then identify the solar ephemeris rather than fixed seasonal minutes.