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Earth's rotation relative to the Sun causes the 24-hour day/night cycle. A diurnal cycle (or diel cycle) is any pattern that recurs every 24 hours as a result of one full rotation of the planet Earth around its axis. [1] Earth's rotation causes surface temperature fluctuations throughout the day and night, as well as weather changes throughout ...
The difference between the shortest and longest night increases approaching the poles. [6] At the equator, night lasts roughly 12 hours throughout the year. [7] The tropics have little difference in the length of day and night. [6] At the 45th parallel, the longest winter night is roughly twice as long as the shortest summer night. [8]
25 May 2012: SpaceX's Dragon spacecraft (pictured) becomes the first commercial spacecraft to rendezvous with the International Space Station. The year 2012 involved many significant scientific events and discoveries, including the first orbital rendezvous by a commercial spacecraft, the discovery of a particle highly similar to the long-sought Higgs boson, and the near-eradication of guinea ...
2012 in science; January–March 2012 in science; 0–9. 2012 transit of Venus; 433 Eros; A. ... July 2012 solar storm; L. List of fellows of the Royal Society ...
As of July 6, Chicago has had four official 100 °F (38 °C) or higher temperature readings, one on June 28, along with three in July, culminating with an official near-record shattering high of 103 °F (39 °C) at O'Hare on both July 5 and 6, reaching 106 °F (41.1 °C) near Chicago, the following day reaching 98 °F shortly before 11 am at O ...
See Venus, Saturn, Jupiter, and Mars align in the night sky this month. Popular Mechanics 22 hours ago Archaeologists followed a forgotten staircase — and uncovered a 400-year-old burial vault
Daytime or day as observed on Earth is the period of the day during which a given location experiences natural illumination from direct sunlight. Daytime occurs when the Sun appears above the local horizon, that is, anywhere on the globe's hemisphere facing the Sun. In direct sunlight the movement of the sun can be recorded and observed using a ...
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