Latitude & Daylight at ソウル

ソウル sits at latitude 37.6°. At this latitude, daylight varies from approximately 14.6h in summer (solstice) to 14.6h in winter — a seasonal swing of 0.0h. The sun reaches a maximum altitude of 75.9° at summer solstice and a minimum of 29.0° at winter solstice. This mid-latitude profile is what shapes ソウル's unique sunrise, sunset, and golden hour patterns year-round.

ソウルの果川（クァチョン）国立科学館は、韓国最大の公共天文台を運営しており、1メートル反射望遠鏡と専用の太陽観測デッキを備えています。近隣の大田（テジョン）にある韓国天文研究院（KASI）はGMT（巨大マゼラン望遠鏡）計画への主要な貢献機関であり、ソウルのアマチュア天文クラブは50以上を数えます——アジアで最も密度の高い地域の一つです。

Golden Hour Photography at ソウル

Golden hour at ソウル occurs when the sun sits between −4° and 6° above the horizon, producing soft, warm, directional light ideal for portrait and landscape photography. At ソウル'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.

北緯37.6度のソウルでは、湿潤大陸性気候の下で真夏の日照は14時間45分に達します。1月の夜の−5°Cから7月の昼の30°Cまでの劇的な季節差は、超モダンなスカイラインと山に囲まれた自然の盆地というソウルの印象的な対比と呼応し、太陽の通り道は東の北漢山から西の冠岳山まで正確な弧を描きます。

UV Exposure & Sun Safety at ソウル

UV radiation at ソウル peaks when the sun is highest in the sky — around solar noon. At 37.6° 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 ソウル'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 ソウル

All solar calculations for ソウル 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 ソウル's coordinates (37.6°, 127.0°) — zero server processing means your location data never leaves your device.