Investigation on the Accuracy of Existing Qibla Directions of the Mosques from Different Periods: A Case Study in corum City, Turkey

İLÇİ V., OZULU İ. M., Arslan E., Alkan R. M.

TEHNICKI VJESNIK-TECHNICAL GAZETTE, vol.25, no.6, pp.1642-1649, 2018 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 25 Issue: 6
  • Publication Date: 2018
  • Doi Number: 10.17559/tv-20170226111205
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1642-1649
  • Keywords: GNSS, mosque orientation, qibla determination, sun qibla time, ORIENTATION
  • Istanbul Technical University Affiliated: Yes


The main goal of this study is to introduce two different approaches (i.e. based on spherical trigonometric formula and using sun qibla time) that can be used to determine the qibla directions of the existing mosques were oriented with sufficient accuracy according to Islamic criteria. In order to do this, eight mosques which were constructed in different periods, 14th, 16th, 17th and 21st centuries in corum City, Turkey, were handled. The existing qibla directions of each mosque were calculated with spherical trigonometric formula and compared with the precisely calculated real qibla directions. The existing qibla directions of the same mosques were once more compared with the real qibla directions which were determined by using the qibla time calculated based on the location and the time of the measurement. The results show that the qibla directions of the recently built mosques were oriented to K (a) over cap 'ba with higher accuracy while the earlier with more deviations. However, the results show that all the deviations were at acceptable levels in terms of Islamic criteria.