2īecause of that difference, on the longest day of the year the sun shines on the eastern edge of Virginia about 37 minutes earlier than on the western tip. The longitude at the eastern edge of Assateague Island on the northeastern corner of Virginia is -75.2861889°, while the longitude at Cumberland Gap is -83.6756599°. The width of Virginia is reflected by the difference in longitude. Those workers may be the most aware that the sun is located at a different place of the sky at any time of the day in eastern vs. Some people, including construction workers and farmers, set their work schedules to start at daylight or end at dusk. The US Department of Transportation determines when Virginians will set their clocks to "spring forward" and "fall back" to maximize the hours of daylight in the summer when people are active. The state follows Daylight Savings Time as established in the Uniform Time Act of 1966. Greenwich Mean Time (Zulu time) served as the basis for "standard time" in Virginia until the switch in 1972 to Coordinated Universal Time based on atomic clocks. After the International Meridian Conference in 1884, the United States defined the "prime meridian" for longitude and timekeeping based on the location of the Greenwich Observatory. Since time was standardized in the United States on November 18, 1883, all of Virginia has been within the Eastern Time Zone.Įach time zone covers roughly 15°'s of longitude. Source: US Geological Survey (USGS), National Map - Standard Time Zones In the Eastern Time Zone In the Eastern Time ZoneĮven Cumberland Gap is well within the boundaries of he Eastern Time Zone
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