Seasons and sky
Polar Day
Direct answer
Polar Day is a period when the Sun remains above the horizon for at least twenty-four continuous hours.
Polar Day is continuous daylight lasting a full day or longer.
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At a glance
- Found in
- Seasons & Earth Almanac
- Related
- Equilux, Polar Night, Astronomical Season, Equinox
Polar Day is continuous daylight lasting a full day or longer.
A Sun-Earth orientation for seasonal, atmospheric, tidal, and terrestrial terms.
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The story behind Polar Day
Arctic and Antarctic peoples have long organized life around continuous-light seasons; scientific stations now record them precisely.
Why Polar Day matters
Polar Day is an extreme expression of axial tilt at high latitudes and can last from one day to months.
Polar Day in practice: an example
At the North Pole, one long Polar Day extends broadly from the March to the September equinox.
Where readings of Polar Day go wrong
The usual misreading is to infer continuous sunshine; clouds can obscure the Sun even while it remains geometrically above the horizon.
Sources and editorial method
Research references used for this entry include:
- NASA Science: Seeing Equinoxes and Solstices from Space - NASA explanation of axial tilt, the terminator, seasonal illumination, equinoxes, and solstices.
- U.S. Naval Observatory: Rise, Set, and Twilight Definitions - Official definitions used for sunrise, sunset, refraction, and twilight calculations.
- Source
- The Great Almanac Dictionary
- Category
- Seasons & Earth Almanac
- Last updated
- 2026-09-26
Map the continuous-daylight zone
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More in Seasons & Earth Almanac
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Common questions
What is Polar Day?
Polar Day is a period when the Sun remains above the horizon for at least twenty-four continuous hours.
What do people get wrong about Polar Day?
The usual misreading is to infer continuous sunshine; clouds can obscure the Sun even while it remains geometrically above the horizon.
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