Compare the Sun in Two US Cities
Pick any two of 15,000+ US places and see them side by side: today's calculated sun times, their daylight curves overlaid across the whole year, and the seasonal differences spelled out. Everything is computed live from each city's coordinates.
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Frequently Asked Questions
Why do two US cities have such different day lengths?
Latitude. The farther a city sits from the equator, the more the seasons stretch and shrink its days. Miami’s longest and shortest days differ by about three hours; in Seattle the swing is over seven hours, and in northern Alaska the sun simply stays up (or down) for weeks at a time. On the equinoxes in March and September, every city briefly matches at close to 12 hours.
Why can sunset differ by hours between cities at the same latitude?
Time zones. The sun crosses the country from east to west at about 15 degrees of longitude per hour, but each time zone shares one clock. A city on the western edge of its zone sees sunset up to an hour later on the clock than a city on the eastern edge, and neighboring zones step the clock a full hour at once.
Is the comparison always up to date?
Yes. When you pick two places, your browser computes today’s sunrise, sunset, twilight, and the full year of daylight from their center coordinates and local timezones. No date-specific table is baked into the permanent static page.