ソーラーインサイトプロ — ゴールデンアワー・日の出日の入り計算機

Latitude & Daylight at パリ

パリ sits at latitude 48.9°. At this latitude, daylight varies from approximately 16.0h in summer (solstice) to 16.0h in winter — a seasonal swing of 0.0h. The sun reaches a maximum altitude of 64.6° at summer solstice and a minimum of 17.7° at winter solstice. This high-latitude profile is what shapes パリ's unique sunrise, sunset, and golden hour patterns year-round.

1667年にルイ14世の命で設立されたパリ天文台は、世界最古の継続的に運用されている天文台です。アラゴ・メダリオン——パリの歩道に埋め込まれた135個の青銅製ディスク——は、1884年に国際子午線会議がロンドンに標準化することを決議するまで、グリニッジと世界の本初子午線の地位を競ったパリ子午線を今も示しています。

Golden Hour Photography at パリ

Golden hour at パリ occurs when the sun sits between −4° and 6° above the horizon, producing soft, warm, directional light ideal for portrait and landscape photography. At パリ's latitude, morning golden hour typically starts in the 1–2 hours after sunrise and lasts approximately 40–70 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48.9度のパリでは、夏の日が16時間10分まで延びます——より低い中緯度のニューヨークや東京の15時間の最大値よりかなり長くなります。この延長された夏の日照は、パリの名高い8月の澄んだ空と相まって、ヨーロッパの主要首都の中でも最も長く最も写真映えするゴールデンアワーの時間帯を生み出します。

UV Exposure & Sun Safety at パリ

UV radiation at パリ peaks when the sun is highest in the sky — around solar noon. At 48.9° latitude, peak UV levels vary significantly by season: summer months see UV indices of 4–6 (moderate), while winter months typically register 0–1 (very low). The World Health Organization recommends sun protection when UV index exceeds 3. At パリ's latitude, this threshold is exceeded for approximately 4–6 months per year, making sun awareness a year-round consideration for outdoor workers and athletes.

How We Calculate Solar Data for パリ

All solar calculations for パリ 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 パリ's coordinates (48.9°, 2.4°) — zero server processing means your location data never leaves your device.