The Latitude Clock · The Terran Sphere

Your Location

Latitude

Longitude

Atlanta, Georgia · 33.7°N · △ Northern Hemisphere

Times use your browser's timezone · Use 📍 for GPS accuracy · East longitudes are positive, West are negative

Your Hemisphere

Your Day Length Today

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Solar Altitude at Noon

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Solar Flux (peak)

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watts per m² at solar noon

Mirror Hemisphere

Mirror Latitude Day Length

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Solar Altitude at Noon

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Solar Flux (peak)

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watts per m² at solar noon

Your Day Arc · Solar Path Today

Solar Declination —

Sunrise —

Solar Noon —

Sunset —

Current Sun Position —

Difference from Mirror Lat —

Day Length Comparison · Same Date · Different Latitudes

Complete Temporal Address

Solar Position (UT) t:0:00:00

Since Midnight —

Hemisphere —

Terran Month —

Movement —

Day Length —

Solar Declination —

Solar Flux —

Legacy Time —

The Spherical Trigonometry

cos(H) = −tan(φ) × tan(δ)

Where H is the hour angle of sunrise and sunset, φ is your latitude, and δ is the solar declination — calculated using the Spencer formula (accurate to ±0.5°), which accounts for the elliptical shape of Earth's orbit. Day length in hours = 2H / 15. Solar noon and rise/set times include the Equation of Time correction.

This formula is the mathematical proof that the same calendar date produces fundamentally different solar experience at different latitudes. A calendar that assigns them identical meaning is not just culturally insensitive — it is geometrically wrong.

Accuracy: approximately ±2–5 minutes for most latitudes. Atmospheric refraction (which extends daylight by ~2 minutes near the horizon) and full planetary ephemeris calculations would bring this to within seconds. For a precise almanac, see timeanddate.com or the USNO Solar Calculator.