Here's why:
* Atmospheric Refraction: The Earth's atmosphere acts like a lens, bending light rays from the sun. This bending makes the sun appear higher in the sky than it actually is. When the sun is near the horizon, the light rays are bent more, making the sun appear to rise earlier than it actually does.
* Sunrise Definition: Sunrise is defined as the moment the upper limb (the edge) of the sun appears above the horizon. However, because of atmospheric refraction, the sun's disk is already partially above the horizon before we can actually see it.
* Time Zones: The time we use is based on standardized time zones. The sun doesn't actually rise at the exact same moment for everyone within a time zone. The difference in time between when the sun rises in different parts of a time zone is usually only a few minutes, but it can contribute to the perception that the sun is "late."
In summary: It's not that the sun is late; it's that we perceive it as rising later due to the effects of atmospheric refraction and time zone differences.
