The Quran's mention of Sirius, the brightest star in the night sky, provides an intriguing example of how Quranic texts can align with modern scientific knowledge. The reference to Sirius is found in Quran 53:49, which says:

At the time the Quran was revealed, people knew of Sirius as a prominent star but had no idea of its exact distance from Earth. Today, we know that Sirius is 8.61 light-years away, which is a standard unit of astronomical distance.

Interestingly, it has been pointed out that the Quran's structure contains a numerical alignment with the distance to Sirius. Specifically, the number of letters between the word "Star" (which appears in verse 1 of Surah An-Najm, "The Star") and the word "Earth" (which appears in verse 32) is exactly 861. This matches the distance of Sirius from Earth in centi-light-years (861 centi-light-years, or 8.61 light-years). This is an interesting coincidence, as such a precise correlation between the number of letters and the actual astronomical distance to a star like Sirius was unknown at the time the Quran was written. The fact that an unlettered man (Prophet Muhammad ﷺ) could have known this distance without divine intervention is a highly unlikely claim.

Sirius, a binary star system, consists of Sirius A (the visible star) and Sirius B (a faint white dwarf). The radius of Sirius A is approximately 1.711 times the radius of the Sun. This ratio of 1.711 has been noted as interesting because it coincidentally mirrors the ratio between the chapter numbers of two Surahs in the Quran: Surah 91 (The Sun), and Surah 53 (The Star). The ratio of the chapter numbers is 91/53, which equals approximately 1.717—a value very close to the radius ratio of Sirius A. This numerical alignment between the star's physical properties and the structure of the Quran is seen by some as another sign of the text's extraordinary accuracy, considering this knowledge was not available at the time.

The Quran's mention of Sirius and its connection to numerical patterns relating to the star's distance and properties is a fascinating instance of how ancient texts may align with modern astronomical discoveries. The precise distance and the ratio between chapter numbers only became known through modern science, yet they seem to have been alluded to in the Quran over 1400 years ago. Whilst these verses might not necessarily reference the scientific findings mentioned here, they showcase how, even the most hard to imagine realities explained by the Quran, can be shown to be permissible with modern scientific discoveries.