question #3 Sahih Muslim 611c, Book 5, Hadith 217 : What significance does the shadow length have in determining prayer times in Islamic tradition?

‘A’isha, the wife of the Apostle (ﷺ), said that the Messenger of Allah (ﷺ) said the afternoon prayer (at the time) when the sun shone in her apartment and its shadow did not extend beyond her apartment.