Sundown, or sunset, is the moment when the upper limb of the Sun disappears below the horizon due to Earth's rotation. This occurs approximately once every 24 hours, but the exact time of sundown varies by location and date. Sunset is distinct from twilight, which follows after the Sun goes below the horizon and includes different phases such as civil, nautical, and astronomical twilight. Locations closer to the poles experience more extreme variations in sunset times, including polar day or night when sunset may not occur on certain days.
If there is a specific location or date of interest, the exact sundown time can be calculated or looked up accordingly.
