The answer to your question depends upon the location in the desert and season of the year.
The time the sun rises in the Sonoran Desert changes on a daily basis. It depends on the specific season of the year. In summer it rises much earlier than during winter.
Dawn
The sun will rise at 4am in the morning. The sun will rise at 4am in the morning.
It doesn't.
It doesn't.
Today the sun rose in central Argentina at 7:57 AM. Tomorrow it is suppose to rise at the same time, 7:57AM.
Eastern
Six O'clock standard time, or very close to it. That's what "time zones" are for.
The Desert Sun was created in 1927.
The sun sets at about the same time as any other location on the same latitude. The time depends upon the specific time of year.
morning before the sun rise (subh)
Due east