Latitude & Daylight at Tokio

Tokio sits at latitude 35.7°. At this latitude, daylight varies from approximately 14.4h in summer (solstice) to 14.4h in winter — a seasonal swing of 0.0h. The sun reaches a maximum altitude of 77.8° at summer solstice and a minimum of 30.9° at winter solstice. This mid-latitude profile is what shapes Tokio's unique sunrise, sunset, and golden hour patterns year-round.

Nur 60 km westlich der Skyline Tokios bietet die Okutama-Region Bortle-3-4-Himmel, an dem die Milchstraße in klaren Nächten mit bloßem Auge sichtbar ist. Diese Nähe zu echtem Dunkelhimmel in einem der größten Ballungsräume der Welt ist äußerst selten — aktiv gefördert durch den NAOJ-Campus in Mitaka mit öffentlichen Sternbeobachtungsprogrammen.

Golden Hour Photography at Tokio

Golden hour at Tokio occurs when the sun sits between −4° and 6° above the horizon, producing soft, warm, directional light ideal for portrait and landscape photography. At Tokio's latitude, morning golden hour typically starts in the hour after sunrise and lasts approximately 28–40 minutes. Evening golden hour mirrors this before sunset. The longer twilight at this latitude gives photographers more time to capture the 'magic hour' compared to equatorial locations where the sun sets more steeply.

Das Nationale Astronomische Observatorium Japans in Mitaka, Tokio, verfolgt Himmelsobjekte seit 1878 und ist damit eine der ältesten kontinuierlich betriebenen astronomischen Einrichtungen Asiens. Sein 20-cm-Refraktor entdeckte 1918 den Asteroiden 'Tokyo', und sein Sonnenturm-Teleskop überwacht noch heute täglich die Sonnenfleckenaktivität — mitten in der Metropole.

UV Exposure & Sun Safety at Tokio

UV radiation at Tokio peaks when the sun is highest in the sky — around solar noon. At 35.7° latitude, peak UV levels vary significantly by season: summer months see UV indices of 6–9 (high), while winter months typically register 1–3 (low). The World Health Organization recommends sun protection when UV index exceeds 3. At Tokio's latitude, this threshold is exceeded for approximately 6–8 months per year, making sun awareness a year-round consideration for outdoor workers and athletes.

How We Calculate Solar Data for Tokio

All solar calculations for Tokio use the Jean Meeus Chapter 25 solar position algorithm with bisection iteration, accurate to ±1 minute for dates between 1901–2099. Sunrise and sunset times define the moment the upper limb of the sun appears on the horizon, accounting for atmospheric refraction. Daily data is calculated client-side from Tokio's coordinates (35.7°, 139.7°) — zero server processing means your location data never leaves your device.