question #1 Sahih Muslim 1094a, Book 13, Hadith 50 : What is the significance of distinguishing between the false dawn and the true dawn in Islamic fasting?

Samura b. Jandub reported Muhammad (ﷺ) as saying. The call of Bilal may not mislead any one of you (and he may, under the wrong impression gathered from it, refrain) from taking meal before the commencement of the fast (for the streaks) of this whiteness (which are vertical indicate the false dawn and the true dawn with which the fast commences is that when the streaks of light are) spread.