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TT-UT1 2000+ ΔT vs. time from 1657 to 2022 [1] [2] In precise timekeeping, ΔT (Delta T, delta-T, deltaT, or DT) is a measure of the cumulative effect of the departure of the Earth's rotation period from the fixed-length day of International Atomic Time (86,400 seconds).
The length of the day (LOD), which has increased over the long term of Earth's history due to tidal effects, is also subject to fluctuations on a shorter scale of time. Exact measurements of time by atomic clocks and satellite laser ranging have revealed that the LOD is subject to a number of different changes.
The Sunnyside Flyer roller-coaster, advertised as having the "dippiest-dips on the continent" [5] was opened in 1923. It was designed by veteran amusement ride builder A. J. Miller, who had built most of the attractions at the prior Hanlan's Point amusement park, and had built roller coasters in North America and Blackpool, England .
The excess revolution time is called length of day (LOD). The absolute value of UT1 can be determined using space geodetic observations, such as Very Long Baseline Interferometry and Lunar laser ranging , whereas LOD can be derived from satellite observations, such as GPS , GLONASS , Galileo [ 2 ] and Satellite laser ranging to geodetic satellites.
Toronto Pearson has five runways, three of which are aligned in the east–west direction, and two in the north–south direction. A large network of taxiways, collectively measuring over 40 km (25 mi) in length, [54] provides access between the runways and the passenger terminals, air cargo areas, and airline hangar areas. [55]
The Canadian International Air Show (CIAS) is an annual air show in Toronto, Ontario, Canada. The show is an aeronautical display of military, government and civilian aircraft, primarily from Canada and the United States. The show takes place along Toronto's waterfront for three days during the Canadian Labour Day weekend.
Daytime length or daytime duration is the time elapsed between beginning and end of the daytime period. Given that Earth's own axis of rotation is tilted 23.44° to the line perpendicular to its orbital plane , called the ecliptic , the length of daytime varies with the seasons on the planet's surface, depending on the observer's latitude .
Some routes are part of the 10-minute network having one or more branches operating at a 10-minute frequency (or better) throughout the day and evening. Otherwise, service frequency varies by route and time of day. Limited service routes: Routes do not serve all hours of the day, or not all days of the week. The frequency of service varies by ...