i have found a new interpretation of [quran 18:90][1] :

"Sahih International" translation :

> Until, when he came to the rising of the sun, he found it rising on a
> people for whom We had not made against it any shield.

as it is about time when the sun started to glow.

any star, when starts to glow, [glows weakly][2] compared to how it glows later:

> Starting at zero-age main sequence, the proportion of helium in a
> star's core will steadily increase, the rate of nuclear fusion at the
> core will slowly increase, as will the star's temperature and
> luminosity. The Sun, for example, is estimated to have increased in
> luminosity by about 40% since it reached the main sequence 4.6 billion
> (4.6 × 109) years ago.


  [1]: https://quran.com/18/83-93
  [2]: https://en.wikipedia.org/wiki/Star#Main_sequence