Geocentric Coordinate Time system. When the Earth is at perihelion in January, TCG ticks even more slowly than it does on average, due to gravitational time dilation from being deeper in the Sun's gravity well and also velocity time dilation from moving faster relative to the Sun. At aphelion in July the opposite holds, with TCG ticking faster than it does on average. Geocentric Coordinate Time Geocentric Coordinate Time (TCG - Temps-coordonnée géocentrique) is a coordinate time standard intended to be used as the independent variable of time for all calculations pertaining to precession, nutation, the Moon, and artificial satellites of the Earth.
Central High School (Pueblo, Colorado) and an outlying building used as a gym and school meeting area. It was built in 1906. The foyer features right-facing swastikas set into the tile floor. The original Central High School building on Pitkin Avenue (later used as an elementary school) was built of pink rhyolite; the "Stone Schoolhouse" was added to the National Register of Historic Places in 1979. Central first opened in 1883, and in 1886 graduated its first class of nine students. In 1889 Central introduced vocational education into its curriculum, making the district the first west of the Missouri River to introduce what was then