The phrase "sunrise in the east" refers to the natural phenomenon where the sun appears to rise in the eastern horizon, marking the beginning of a new day. This occurs due to the Earth's rotation on its axis from west to east. The Earth's rotation causes the sun to appear to move from east to west across the sky, and as the Earth rotates, the sun rises in the east and sets in the west.

This phenomenon is consistent across the entire Eastern Hemisphere, which includes North America, Europe, Asia, and parts of Africa and Australia. The time at which the sun rises varies depending on the specific location and the time of year, but the direction of sunrise remains the same. For instance, in the United States, the sun rises in the east for all states, regardless of their longitude or latitude.

The reason for this is rooted in the Earth's axial tilt and rotation. The Earth's axis is tilted at an angle of approximately 23.5 degrees relative to its orbital plane around the sun. This tilt is what causes the changing seasons and the variation in sunrise and sunset times throughout the year. During the summer months, the Earth's Northern Hemisphere is tilted towards the sun, resulting in longer days and the sun rising higher in the sky. Conversely, during the winter months, the Northern Hemisphere is tilted away from the sun, leading to shorter days and the sun rising lower in the sky.

Data from the U.S. National Oceanic and Atmospheric Administration (NOAA) supports this understanding. According to NOAA, the Earth's rotation period is approximately 24 hours, and the Earth's axial tilt is about 23.5 degrees. This consistent rotation and tilt ensure that the sun rises in the east for all locations in the Eastern Hemisphere. Additionally, the Earth's orbit around the sun is nearly circular, which also contributes to the consistent sunrise direction.

In conclusion, "sunrise in the east" is a universal phenomenon in the Eastern Hemisphere due to the Earth's rotation and axial tilt. This understanding is supported by scientific data from organizations like NOAA, which confirms the consistent direction of sunrise across the entire Eastern Hemisphere.