Sunrise

Sunrise is the moment when the upper limb of the Sun appears on the horizon in the morning. The term can also refer to the entire process of the solar disk crossing the horizon and its accompanying atmospheric effects.

Definition

The astronomical definition of sunrise is the moment when the upper limb of the Sun appears on the horizon due to the Earth's rotation. This is the moment when the Sun's disk is not yet visible, but its light is already illuminating the sky.

Timing

The timing of sunrise varies throughout the year and is also affected by the viewer's longitude and latitude, altitude, and time zone. These changes are driven by the axial tilt of Earth, the planet's movement in its annual elliptical orbit around the Sun, and the Earth's constant rotation.

Cultural aspects

Sunrise has a significant cultural impact. It symbolizes the start of a new day in many cultures and religions. It is often associated with rebirth and new beginnings. Many ancient structures were built to align with the sunrise of certain dates, such as solstices and equinoxes.

Effects on the atmosphere

The atmospheric effects of sunrise can be spectacular and beautiful. The colors of the sunrise are usually more brilliant than those of the sunset. This is because the morning air contains less dust and fewer particles.

See also

• Sunset
• Dawn
• Twilight
• Daytime

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