wrote in message

Fwiw, at 6.15 am, which is when I leave for work, my C240's auto
headlights don't come on. That must translate into adequate enough
daylight at that time of the day here in Dubai!

If your lights don't come on at 0615, then it is surely light enough. But
bear this in mind: Lexington, KY, is near the western edge of Time Zone R,
known as Eastern (Daylight) Time. Being at the western edge, the entire
span of daylight will be skewed a bit later than nominal for that time zone.
Dubai, on the other hand, is at the extreme eastern side of Time Zone C,
Middle East Time. In point of fact, Dubai is geographically located well
into Time Zone D, although it appears the entire UAE uses the UTC +3 of Zone
C. Being at the extreme eastern edge of your zone, your daylight span will
be substantially skewed toward the earlier range of the clock.

Consequently, sunrise on August 27 occurred at 0457 in Dubai, but 0704 in
Lexington, KY.