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The Globe included mechanisms to show the annual movement of the Sun and to drive a "world clock" that indicated where on Earth it was midday or midnight. The Globe was driven, either by water power from the basement to make one turn in 24 hours, or manually by the occupant of the Globe to accelerate the otherwise imperceptible motion.
Earth's rotation is slowing slightly with time; thus, a day was shorter in the past. This is due to the tidal effects the Moon has on Earth's rotation. Atomic clocks show that the modern day is longer by about 1.7 milliseconds than a century ago, [1] slowly increasing the rate at which UTC is adjusted by leap seconds.
Jagiellonian globe. The Jagiellonian globe, also known as the Globus Jagellonicus, is a mechanical armillary sphere made in France before 1510. It is an astronomical instrument and a universal clock tracking both local solar time and sidereal time. The central brass sphere is engraved with a map of Earth and contains the clock mechanism.
The Shortt–Synchronome clock, an electrical driven pendulum clock designed in 1921, was the first clock to be a more accurate timekeeper than the Earth itself. [ 167 ] A succession of innovations and discoveries led to the invention of the modern quartz timer.
The globe was built with a scale of 1:1,000,000, on which one inch represents sixteen miles (1mm = 1km). [ 3 ] [ 4 ] As with most globes, it is mounted at a 23.5 degree angle, the same axial tilt as the Earth itself; thus the equator is diagonal to the floor.
A torsion pendulum clock, more commonly known as an anniversary clock or 400-day clock, is a mechanical clock which keeps time with a mechanism called a torsion pendulum. This is a weighted disk or wheel, often a decorative wheel with three or four chrome balls on ornate spokes, suspended by a thin wire or ribbon called a torsion spring (also ...
The grounds around the Unisphere were landscaped in 1992, [50] but the renovation of the Unisphere itself was delayed due to a lack of money. [51] Preservationists objected when some of the trees around the Unisphere, dating to the 1964 World's Fair, were removed and replaced with trees that were easier to maintain. [ 52 ]
It has since been set backward 8 times and forward 17 times. The farthest time from midnight was 17 minutes in 1991, and the nearest is 90 seconds, set in January 2023. The Clock was moved to 150 seconds (2 minutes, 30 seconds) in 2017, then forward to 2 minutes to midnight in January 2018, and left unchanged in 2019. [5]
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