CORRECTION of CITY INDEX AT QIBLA COMPASS

Bismillahirrahmaanirrahiim 

 Because the debate of Qibla direction angle for area Kobe (Japan) between me and Helfi Amalia via Yahoo Messenger which actually misunderstands; I am directive at number degree of compass (0-360°) while Helfi directive at degree of Kompas Kiblat (0-??), hence I plan to buy this peripheral (Qibla Compass) when having arrived at Jakarta later. that moment I insist that qibla direction from Kobe is 283,1° (or back Azimuth 76,9°) while Helfi also insists 1??° (I'm forget… (: P)). 

I surprised and vexed, why Qibla compass doesn't use common value in degree? 

 Alhamdulillah now this peripheral are on-hand. The value spread is simply 0-400, this named value CITY INDEX. 

In guide-book figured in as described way of usage and index numbers from various towns, for example as follows:

 Jakarta, Semarang, Yogyakarta, surabaya= 75 

Japan Area = 100-105. 

 When Tip Of Compass needle in straightening with value City Index, hence arrow will show qibla direction. 

So degree value of 0-360 equivalents with index value 0-400. 

 Now let's observe this Qibla compass: Ordinary compass value (CC, 0-360) we would put on a par formerly with value Index Qibla compass Kiblat (QC, 0-400) harshly ( naked eye): 0° CC = 0 QC 90° CC= 100 QC 180°CC= 195 QC 270°CC= 295 QC Qibla Direction from Jakarta, after corrected with Variation (= Magnetic Declination) shown by compass needle 294,36°, back azimuth 65,64°, this equivalent would (coincide) with value Index 73 (precisely 72,93. NOT 75 like the one written in guide-book). 

Calculation is more accurately as follows: (65,64 x 400) / 360= 72,93 Qibla Direction in Kobe Jepang, back azimuth 62,4°, City Index value: (62,4 x 400) / 360= 69,32 ( far below number 100 like the one as described in guidance). 

 Has numeral in City Index data has experienced rounding? I don't know. But I suggest is better to mentioned also its default value in order not to mislead. 

  CONCLUSION 

1. Qibla Compass Guidance Value is not acurate, (if I don't want to be told is wrong and misleads). Especially if applied in this year ( 2008). 

2. If Only Correctness guidance value, ought to there are notification is done correction per annum, because of existence of VARIATION compass to differ in every place & every time. 

3. I suggest usage of Qibla scheme with help of SUN (open Download page). But if you do not want to be busy, I have listed correction of this value of City INDEX qibla compass for certain towns of Indonesia, be in the form of file PDF. Click and download here. (There is also Calendar Qibla direction based on the sun shadow). 

 Doesn't mean complicating situation but of course the above is true in reality. 

Requests correction if wrong. 

 Genghis Khun 

 Reference 

1. Accurate Times 

2. Mooncalc & Qiblacalc v1 by dr. Monzur Ahmed. 

3. Distance & Bearing by Judson McCranie ( j.mccranie@adelphia.net) 

4. Calculator Online magnetic Declination 5. Topography Map of Indonesia