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Salah Timings

Fajr
Dawn to sunrise, should be read at least 10–15 minutes before sunrise.

Dhuhr
After true noon until Asr.

Asr
Afternoon.

Maghrib
After sunset until dusk.

Isha’a
Dusk until dawn (it is makrooh to read Isha after midnight)


References:-
Titus Burckhardt, Art of Islam, Language and Meaning : Commemorative Edition, World Wisdom, Inc, 2009, page 128