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Earth Day is an annual event on April 22 to demonstrate support for environmental protection. First held on April 22, 1970, it now includes a wide range of events coordinated globally by EARTHDAY.ORG (formerly Earth Day Network) [1] including 1 billion people in more than 193 countries. [2] [1] [3]
In road events, the course is not required to be a circuit, but the overall decrease in elevation between the start and finish shall not exceed 1:1000, i.e. 1 m/km. In road events, the start and finish points of a course, measured along a theoretical straight line between them, shall not be further apart than 50% of the race distance.
EOSDIS. The Earth Observing System Data and Information System ( EOSDIS) is a key core capability in NASA 's Earth Science Data Systems Program. Designed and maintained by Raytheon Intelligence & Space, it is a comprehensive data and information system designed to perform a wide variety of functions in support of a heterogeneous national and ...
The team of authors — formed to provide annual scientific updates between the every seven- to eight-year major U.N. scientific assessments — determined last year was 1.43 degrees Celsius ...
The warmest day on record for the entire planet was 6 July 2023, when the highest global average temperature was recorded at 17.08 °C (62.74 °F). The month of July 2023 was the hottest month on record globally. September 2023 was the most anomalously warm month, averaging 1.8 degrees Celsius above the preindustrial average. Table
Δ. T. (timekeeping) 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). Formally, Δ T is the time difference ΔT = TT − UT between Universal Time (UT, defined by Earth's ...
Zenithal hourly rate. 10 [1] See also: List of meteor showers. The Ursid (URS) meteor activity begins annually around December 17 and runs for over a week, until the 25th or 26th. This meteor shower is named for its radiant point, which is located near the star Beta Ursae Minoris (Kochab) in the constellation Ursa Minor .
Sidereal time is a "time scale that is based on Earth's rate of rotation measured relative to the fixed stars ". [1] Viewed from the same location, a star seen at one position in the sky will be seen at the same position on another night at the same time of day (or night), if the day is defined as a sidereal day (also known as the sidereal ...