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Actual sunset: Two minutes before the Sun disappears below the horizon. Sunset (or sundown) is the disappearance of the Sun at the end of the Sun path, below the horizon of the Earth (or any other astronomical object in the Solar System) due to its rotation.
Burt's solar compass or astronomical compass/sun compass is a surveying instrument that makes use of the Sun's direction instead of magnetism. William Austin Burt invented his solar compass in 1835. The solar compass works on the principle that the direction to the Sun at a specified time can be calculated if the position of the observer on the ...
Sunset provisions have been used extensively throughout legal history. [2] The idea of general sunset provisions was discussed extensively in the late 1970s. [3] Sunset clauses with an effective extension review process have been argued as a safeguard of democracy to ensure emergency provisions, such as state of emergency, remain temporary. [4]
In November 2022, Quizlet announced a new CEO, Lex Bayer, the former CEO of Starship Technologies. [23] In March 2023, Quizlet started to incorporate AI features with the release "Q-Chat", a virtual AI tutor powered by OpenAI's ChatGPT API. [24] [25] [26] Quizlet launched four additional AI powered features in August 2023 to assist with student ...
An instrument used to measure the proper acceleration of a body irrespective of other forces. acoustics The branch of physics dealing with the production, transmission, and effects of sound. adhesion adhesion is what makes things stick together. It's the force that allows tape to stick to a surface or glue to hold two objects together. Contrast ...
This glossary of astronomy is a list of definitions of terms and concepts relevant to astronomy and cosmology, their sub-disciplines, and related fields. Astronomy is concerned with the study of celestial objects and phenomena that originate outside the atmosphere of Earth. The field of astronomy features an extensive vocabulary and a ...
The heliotrope is an instrument that uses a mirror to reflect sunlight over great distances to mark the positions of participants in a land survey. The heliotrope was invented in 1821 by the German mathematician Carl Friedrich Gauss.
An instrument invented by the mathematician and astronomer Bhaskara II (1114–1185 CE) consisted of a rectangular board with a pin and an index arm. [39] This device—called the Phalaka-yantra—was used to determine time from the Sun's altitude. [39] The Kapālayantra was an equatorial sundial instrument used to determine the Sun's azimuth. [39]