Accurate Times is the official program adopted by the Jordanian Ministry of Islamic Affairs to calculate the prayer times in Jordan. The program runs under Windows, and it is written by Mohammad Odeh, a member of the Jordanian Astronomical Society (JAS), and the Vice-President of Crescents' Observation and Mawaqeet Committee, of the Arab Union for Astronomy and Space Sciences (AUASS).

Accurate Times calculates the following astronomical events:-

1. Islamic prayer times (Fajer, Shuroq, Dhohur, Aser, Maghreb, and Isha).
2. Sun times (Beginning and end of twilight, sunrise, sunset, and Sun transit).
3. Moon times (Moon rise, Moon transit, and Moon set).
4. Moon phases (Geocentric or Topocentric).
5. Crescent visibility for both; new and old crescents.
6. Crescent visibility world map for both; new and old crescents.
7. Calculations for Sun and Moon ephemeris.
8. Qiblah direction (Direction to Ka'bah in Mecca).
9. Qiblah time (The time at which the Sun or Sun's shadow is at the Qiblah direction).
10. Hejric-Gregorian conversion.
11. The prayer call (Athan) launches automatically when it is the time of the prayer.
12. A reminder is heard few minutes before the next prayer.

Accurate Times calculates the direction of the Qiblah, that is where to look to face the shortest way to Mecca (Ka'bah). It also calculates the Qiblah time, that is the time at which the Sun is at the Qiblah direction, or when the Sun's shadow is pointing towards the Qiblah direction. Accurate Times shows also the Qiblah World Map; that is a wolrd map which contains the Qiblah direction for the whole world as colored bands. Please find below a small version of the Qiblah World Map.

Accurate Times can be used to convert the Hejric date to Gregorian/Julian and vise versa. However, kindly notice that the actual sighting of the crescent is NOT adopted for determining the first day of the Hejric month.

Accurate Times contains several options which cannot be found at once in any other program. Kindly find below the options available in Accurate Times:

• Fajer & Isha angles: It is generally agreed that the Fajer prayer or the Isha prayer occurs when the altitude of the Sun's center is 18 degrees below the horizon . However, some countries or organizations prefer to adopt another value, such as 16, 19, or 21 degrees, ...etc.

• Summer Time: Several countries use the Summer Time, so using this option enables you to get the correct times of the prayers during Summer Time.

• Addition or subtraction: Some organizations prefer to add or subtract a few minutes of a certain prayer time, such as the Fajer, Dhuhor, or Maghreb.

• Elevation: Times of sunrise and sunset at a site that is 1000 meters above sea-level for example, will be different than those at sea-level. The Sun rises at a site which is 1000 meter above sea-level, well before it does so at a site located at sea-level. While it sets at the elevated site after it does so at sea-level. At 1000 meters above sea-level, the average difference is somewhere between 5-13 minutes (Depending on the location's latitude).

• Aser Prayer: The user can choose either the Shafi'i or Hanafi Mazhab.

• Precision Format: The output results can be either in hh:mm format or hh:mm:ss format.

• Language: The program supports two languages; Arabic and English. However, both; the help file and the output file are both in English language only.

Accurate Times offers two kind of alerts. The first one is few Beeps you hear before a certain time you specify. This can be used to remind you to perform the previous prayer before the next prayer occurs! The second alert is to hear the prayer call (Athan) when it is the time of the prayer. The user has the option to choose to hear either Mecca Athan or Jerusalem Athan.

• Refraction: For sunrise and sunset, most of the programs adopt the standard value of refraction, that is, 34 arc minutes. However, this value varies within seasons (as a function of temperature and pressure), and this variation could change the time of sunrise and sunset by some dozens of seconds. Thus, it would be better to enter the exact / average values of temperature and pressure for your location. Notice that the standard conditions assume your location's temperature to be 10 C and your location's pressure to be 1010 mbars. But these values are the standard conditions at sea-level. For instance, a site at 1000 meters above sea-level will have a standard pressure of about 900 mbars !

• City Settings: City Settings: Accurate Times, can be used to generate prayer times for a specific city. However, it would be a puzzling decision which to choose for calculations; the eastern parts of the city or western parts! This option should be a good solution for this problem. For example, assume that you want to calculate the prayer times for Amman (Capital of Jordan), which is of a 12-Km diameter. So, from the Location menu enter the coordinates of the most western part of Amman, and in the City Settings, enter the number 12. Now when you generate the prayer times for Amman, the times of the Fajer and Shuroq will be calculated for the eastern parts of the city, which is 12 Km to the east of your original coordinates. While the times of Dhohur, Aser, Maghreb and Isha prayers will be calculated for the western parts of Amman.

Accurate Times shows the possibility of seeing the crescent all over the world by drawing colored curves on the world map. Where each color identifies a certain possibility of seeing the crescent. Some of the features which Accurate Times offers are:-

1. Draws the curve for both; waxing (new) and waning (old) crescent.
2. Shows the possibility of seeing the crescent according to three criteria; Odeh, Yallop and SAAO.
3. Shows the impossible sightings. Where the sighting is considered impossible if the Moon sets before the Sun, or the Topocentric (not Geocentric) conjunction occurs after the sunset. For waning (old) crescent, the sighting is considered impossible if the Moon rises after the Sun, or the Topocentric (not Geocentric) conjunction occurs after the sunrise.
4. Saves the Crescent Visibility World Map as image simply by clicking on a button.

The meaning of the colors for each criterion is as follows:

A- Odeh Criterion:-

1. Blue: Need Optical Aid : Crescent is visible by optical aid only.
2. Magenta: Could be Seen by Naked Eye: Crescent is visible by optical aid, and it could be seen by naked eye.
3. Green: Easily Visible by Naked Eye: Crescent is easily visible by naked eye.

B- Yallop Criterion:-

1. Blue: Need Optical Aid: Will need optical aid to see the crescent.
2. Magenta: May Need Optical Aid: After seeing the crescent by optical aid, it could be seen by naked eye.
3. Yellow: Naked Eye at Perfect Conditions: Visible by naked eye under perfect atmospheric conditions.
4. Green: Easily Visible by Naked Eye: Crescent is easily visible by naked eye.

C- SAAO Criterion (South African Astronomical Observatory):-

1. Blue: Crescent Visibility is Improbable: Seeing the crescent without a telescope or binoculars is exceedingly unlikely. Sighting the moon with optical aid may be possible.
2. Green: Crescent Visibility is Possible: Crescent is visible by naked eye.

For all criteria:-

1. Red: Impossible: This happens if Moonset occurs before Sunset, or the topocentric conjunction occurs after Sunset.
2. No Color: Not Possible: This happens when the topocentric conjunction occurs before Sunset, and Moonset occurs after Sunset, but the brightness of the crescent is not enough to be seen even by optical aid.
3. Cyan: Unknown: This happens at high latitudes when there is no Moonset/Moonrise event on the visibility day. In such a case, determining the visibility of the crescent needs more sophisticated algorithm than what is currently adopted in Accurate Times.

Please highly notice that the visibility of the crescent at the beginning of each zone highly depends on the atmospheric conditions, acuity of vision, experience of the observer and looking at the location of the crescent.

New Crescent Visibility Map (07 June 2005)

Old Crescent Visibility Map (06 June 2005)

All care was taken to ensure the most accurate results. Comparing the results of Accurate Times software with those of the Astronomical Almanac, it was found that ALL the results were exactly the same, within an accuracy of about one second, except for the Dhohur time where the maximum error was about 0.03 second!

Special thanks go to people who offered their kind assistance or suggestions, such as: Mr. Ahmad Al-Ashi, Mr. Ahmad Niamat, Dr. Bernard Yallop, Prof. Hasan Bilani, Mr. Jean Meeus, Mr. Marwan Shweaki, Mr. Mohammed Al-Hati, Dr. Tarek Katbeh and Mr. Tareq Hadi.

What is new in Accurate Times 5.1

- Fix a bug in Summer Time for Southern Hemisphere.
- Better screen view at 800X600 screen resolution for both; Crescent Visibility Map and Worldwide Qiblah Map.

What is new in Accurate Times 5.011

- Fix a bug causes Run-Time Error when doing some calculations if the decimal separator is comma instead of dot.

What is new in Accurate Times 5.08

- Qiblah World Map was added.

What is new in Accurate Times 5.0

- Waxing (New) and waning (Old) crescent visibility maps were added.

What is new in Accurate Times 4.1

- Calculations for Sun and Moon Ephemeris.

What is new in Accurate Times 4.0

- Crescent Visibility for both; New and Old crescents was added

What is new in Accurate Times 3.6

- Moon Coordinates are calculated using ELP 2000-85 theory. Thus, Moon Times and Moon Phases are much accurate than previous versions.

What is new in Accurate Times 3.5

- Geocentric or Topocentric Moon Phases Calculation was added.
- Find the time at which the Sun's shadow points towards Qiblah direction.

What is new in Accurate Times 3.2

- The effect of Delta T is included for Prayer and Moon Times.
- A bug in Qiblah Times which reduced the accuracy for about one minute in some locations at some dates was fixed.

What is new in Accurate Times 3.1

- More reliable prayer times at high latitudes.
- Incorrect Moon times at some locations was fixed.
- Incorrect Qiblah times at some locations was fixed.
- Today's prayer times appear automatically on the main menu.
- Special Athan for Fajer prayer.
- The option to hear either Mecca Athan or Jerusalem Athan.
- Add an icon in the task bar.
- The time of next prayer appears when the mouse is put above the task bar icon.
- Run-time error at Windows XP startup was fixed.
- Failed installation on Windows NT was fixed.
- Add a progress bar on the waiting form.