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AM 1.5 global solar spectrum sunlight (= 1,000.4 W/m 2) [3] [circular reference] 20,000 lux: Shade illuminated by entire clear blue sky, midday 1,000–2,000 lux: Typical overcast day, midday 400 lux: Sunrise or sunset on a clear day (ambient illumination) <200 lux: Extreme of thickest storm clouds, midday 40 lux: Fully overcast, sunset/sunrise ...
0.0008 is the fractional Julian Day for leap seconds and terrestrial time (TT). TT was set to 32.184 sec lagging TAI on 1 January 1958. By 1972, when the leap second was introduced, 10 sec were added. By 1 January 2017, 27 more seconds were added coming to a total of 69.184 sec. 0.0008=69.184 / 86400 without DUT1.
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Daylight saving time ends on Nov. 3, 2024. Here's everything to know, from when the clocks go back to how to adjust your routine to avoid negative health effects and more.
The tz database partitions the world into regions where local clocks all show the same time. This map was made by combining version 2023d with OpenStreetMap data, using open source software. [1] This is a list of time zones from release 2025a of the tz database. [2]
Then civil twilight continues almost all night, only a little bit of nautical twilight around the local midnight. Above 66.56° latitude, there is no sunset at all, a phenomenon referred to as the midnight sun. Solstice day arcs as viewed from 70° latitude. At local noon the winter Sun culminates at −3.44°, and the summer Sun at 43.44°.
English: Approximate length of daylight, in hours, as a function of latitude and time of year. Here, the length of daylight is defined as the period from the beginning of civil twilight in the morning to the end of civil twilight in the evening.
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related to: locations of daylight chart for kids worksheets 1 2 3 all eyes on me