Tokyo's daylight rhythm
At 35.7° N, Tokyo runs from about 9 hours 45 minutes of daylight in late December to 14 hours 30 minutes in late June. Japan does not observe daylight saving time, so clock times track the sun closely all year — sunrise before 04:30 in June and after 06:45 in January, Tokyo time.
Why Tokyo sunrises feel early
Japan's single time zone (UTC+9) sits far west inside its zone width, pushing solar noon late in the western provinces and early around Tokyo. Compared with Shanghai at the same latitude, Tokyo's winter sunsets come noticeably earlier on the clock — a quirk of politics rather than astronomy.
Sources and standards
Where these figures come from
Every formula on this page is implemented from the published reference material below. Where a value depends on a regional code, the calculator lets you override it rather than assuming one jurisdiction.
- NOAA Global Monitoring Laboratory — Solar Calculator — the solar position algorithm underlying sunrise, sunset and solar noon.
- NASA Science — Sun — solar geometry and the definition of civil, nautical and astronomical twilight.
- NIST Time and Frequency Division — time standards and the definition of the day.
Figures, formulas and reference tables last verified: 24 September 2026.