Seasons and sky
Solar Declination
Direct answer
Solar Declination is the angular distance of the Sun north or south of the celestial equator.
Solar Declination is the Sun celestial latitude relative to the equator.
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At a glance
- Found in
- Seasons & Earth Almanac
- Related
- Subsolar Point, Obliquity of the Ecliptic, Astronomical Season, Equinox
Solar Declination is the Sun celestial latitude relative to the equator.
A Sun-Earth orientation for seasonal, atmospheric, tidal, and terrestrial terms.
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The story behind Solar Declination
Declination tables were central to nautical almanacs because navigators could combine them with observed solar altitude to find latitude.
Why Solar Declination matters
Solar Declination controls the latitude of the subsolar point and strongly shapes day length and noon altitude through the seasons.
Solar Declination in practice: an example
Solar Declination is near zero at an equinox and reaches about 23.4 degrees north or south at a solstice.
Where readings of Solar Declination go wrong
A common error is to confuse declination with altitude; altitude also depends on observer latitude, hour angle, and refraction.
Sources and editorial method
Research references used for this entry include:
- NOAA Global Monitoring Laboratory: Solar Calculator Glossary - NOAA definitions for solar geometry, atmospheric refraction, and civil, nautical, and astronomical twilight.
- U.S. Naval Observatory: The Seasons and the Earth's Orbit - Official explanation of axial tilt, solstices, equinoxes, perihelion, aphelion, and seasonal sunlight.
- Source
- The Great Almanac Dictionary
- Category
- Seasons & Earth Almanac
- Last updated
- 2026-09-26
Track the Sun north-south motion
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Common questions
What is solar declination?
Solar Declination is the angular distance of the Sun north or south of the celestial equator.
What do people get wrong about solar declination?
A common error is to confuse declination with altitude; altitude also depends on observer latitude, hour angle, and refraction.
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