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https://www.alaskaaircargo.com/alaska/myths-and-facts-about-alaskas-24-hour-sunlight-and-darkness/
Jan 22, 2020 · 3. 24-Hour Light Means the Sun is Always Out. When we think of bright summers or dark winters in Alaska, we’re usually thinking of extremes. Alaska and …Estimated Reading Time: 3 mins
https://www.alaska.org/advice/shortest-day-in-alaska
2:41 pm. 3 hours 42 minutes. Barrow. The Arctic: 330 miles. north of Arctic Circle. January 23. November 18. 67 days of darkness. Even though residents of Barrow, the northernmost town in Alaska, won't see the sun for 67 days come winter, they enjoy …
http://www.timeanddate.com/worldclock/sunearth.html
Day and Night World Map. The map shows day and night on Earth and the positions of the Sun (subsolar point) and the Moon (sublunar point) right now. UTC time = Saturday, August 21, 2021 at 16:06:00. = The Sun's position directly overhead (zenith) in relation to an observer.
https://www.highmowingseeds.com/blog/photoperiodism/
Photoperiod: The recurring cycle of uninterrupted light and dark periods a plant is exposed to; usually 24 hours, with varying ratios of uninterrupted light and dark periods. Long-Day Plant (LD): A long-day plant requires >12 hours of sunlight, or <12 hours of uninterrupted darkness, to produce a bloom or flower.
https://www.timeanddate.com/sun/
Calculate local times for sunrises, sunsets, meridian passing, Sun distance, altitude and twilight, dusk and dawn times.
https://www.royalqueenseeds.com/blog-the-importance-of-the-dark-cycle-in-cannabis-cultivation-n906
Jun 14, 2018 · 12-12, the even split of 12 hours of light and 12 hours of darkness, only occurs naturally close to the equator. Indoor growers rely on timers to artificially dial in this light-dark cycle. During the day or lights-on period, two receptors, phytochrome red and phytochrome far-red, are in balance. In darkness, the far-red change into red.
https://www.timeanddate.com/astronomy/equinox-not-equal.html
Refraction: Light Lingers. Another reason for why the day is longer than 12 hours on an equinox is because the Earth's atmosphere refracts sunlight.. This refraction, or bending of the light, causes the Sun’s upper edge to be visible from Earth several minutes before the edge actually reaches the horizon.
https://www.growweedeasy.com/mature-faster-switch-to-10-14-light-schedule
Most indoor growers give their plants 12 hours of darkness and 12 hours of light each day to initiate budding and continue with that 12/12 light schedule until it's time to harvest. A 12 hour night is long enough to force almost any cannabis plant to enter the flowering stage and finish maturing in a reasonable amount of time.
https://www.timeanddate.com/sun/uk/london
Calculations of sunrise and sunset in London – England – United Kingdom for September 2021. Generic astronomy calculator to calculate times for sunrise, sunset, moonrise, moonset for many cities, with daylight saving time and time zones taken in account.
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