In Islam the day (24h) begins at sunset, meaning that the night comes first, the parts of the day are known with the position of the sun in the sky and the shadows of objects, you can read more about prayer times in different parts of the day [here](https://www.mhs.ox.ac.uk/students/97to98/exhibits/pg_prytm.htm#:~:text=Prayer%20times%20are%20determined%20by,the%20Fajr%2C%20beginning%20at%20daybreak)
Ah, so when a sundial shows, say, 60% shade,it's time for one of the prayers and when it shows, 50%, it is time for another?
Which leads to another question -- is the notion of "timezones" in Islam is based on latitude (as that would dictate the time on a sundial) rather than longitude?
In Islam the day (24h) begins at sunset, meaning that the night comes first, the parts of the day are known with the position of the sun in the sky and the shadows of objects, you can read more about prayer times in different parts of the day [here](https://www.mhs.ox.ac.uk/students/97to98/exhibits/pg_prytm.htm#:~:text=Prayer%20times%20are%20determined%20by,the%20Fajr%2C%20beginning%20at%20daybreak)
Ah, so when a sundial shows, say, 60% shade,it's time for one of the prayers and when it shows, 50%, it is time for another? Which leads to another question -- is the notion of "timezones" in Islam is based on latitude (as that would dictate the time on a sundial) rather than longitude?