According to the Hanafi School, the Maghrib prayer time begins at sunset and the end of its time is as long as the twilight (the redness in the sky) has not departed. The Isha prayer begins as soon as the twilight has departed.

Ishtibāk al‑Nujūm: The recommended time to pray Maghrib is when it enters until the sky fills with stars - known as Ishtibāk al‑Nujūm. This is usually around twenty minutes after sunset and is based on the Hadith of the Prophet (Allah bless him and give him peace): “My nation will continue to be upon righteousness as long as they pray Maghrib before the sky fills with stars.” [Abu Dawud, al-Sunan]

Praying Maghrib after this time (Ishtibāk al‑Nujūm) is prohibitively disliked (makruh tahriman) [Tahtawi, Hashiya Maraqi al-Falah]. One should try their best to pray Maghreb as soon as it enters. Of course, if one is in a situation where they have no choice but to delay praying Maghreb right before Isha, this is permissible.
Note: An altitude angle of -10° for Ishtibāk al‑Nujūm has been documented by King 2003 and this is what is adopted here.

The Sun is visible for a few minutes after actual sunset due to atmospheric refraction of light, as well as light pollution. Actual sunset is the actual crossing of the horizon by the Sun. When the Sun is slightly below the horizon, the Sun's light comes from less dense air to more dense air. Therefore, light is refracted downwards as it passes through the atmosphere. As a result, the Sun appears to be raised above the horizon and we are able to see the Sun minutes after the actual sunset. Thus, the time difference between actual sunset and the apparent sunset is about 2-5 minutes.

Maghrib is not at actual sunset. Rather, as with every other visible phenomena that is linked with Muslim worship, it is the time of the actual observation. Therefore, diligence must be observed for if a fast is broken at actual sunset while the Sun is still visible on the horizon, then it will have been prematurely broken, and therefore, null and void.

Apparent Sunset

Click here to read more about apparent sunset and maghrib time.

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