Times of Salaah

Q: My question is can I pray fajr Salaah before sunrise when it is light? If sunrise is at 7:40 and I pray at 7am or 6:40, will my fajr salaah be valid?

Q: Does zuhr time expire at the beginning of Asr shafi'i or at Asr hanafi time?

Q: Can we pray Zuhr half an hour before Asr?

Q: Zaid prayed Zuhr Salaah in Asr misl-e-awwal time. Thereafter on the same day zaid prayed Asr Salaah in misl-e-awwal time. Is the Asr Salah valid? In the above situation if the Asr Salaah is not valid, does Zaid have make qadha of the Asar Salah?

Q: If a follower of hanafi fiqh prays asr salaah individually or as an Imam at a time when the time of asr has not started according to the hanafi maslak but started according to the maslak of the other three imams, is this salaah valid?

Q: What is the end time of the (a) Israaq prayer and (b) Duha prayer? I already know their start times and preferred times, but would like to know their end times please.

Q: I heard that praying fajr after sunrise is an act of shirk. But what if I accidentally prayed fajr 2 minutes after sunrise without knowing it was past the time for fajr?

Q: Can I read Fajr namaaz after Azaan without waiting as we read maghrib?

Q: What is the definition of twilight? In beheshti zewar English it says the redness on the western horizon, when that disappears then esha time comes in. However some kitaabs mention the twilight according to imam Abu hanifa as the whiteness after the redness. Which is correct. Why is it mentioned as redness in the beheshti zewar, would this not make our esha time early like the shafis etc.

Q: What is the definition of sunrise/shurooq? When the sun slightly appears on the horizon or when the sun completely is visible on the horizon?