Latitude & Daylight at ケープタウン

ケープタウン sits at latitude -33.9°. At this latitude, daylight varies from approximately 9.7h in summer (solstice) to 9.7h in winter — a seasonal swing of 0.0h. The sun reaches a maximum altitude of 79.5° at summer solstice and a minimum of 32.6° at winter solstice. This mid-latitude profile is what shapes ケープタウン's unique sunrise, sunset, and golden hour patterns year-round.

ケープタウンには、天文台（Observatory）地区に南アフリカ天文台（SAAO）があります——南半球最古の常設天文台で、1820年から運用されています。市街地の背後にそびえる標高1,085mのテーブルマウンテンは、「テーブルクロス」と呼ばれる独特の地形性雲現象を生み出します——南東風が湿った空気を山肌に押し上げることで形成される雲の層で、市街地のボウル全体に劇的な日没のシルエットを映し出します。

Golden Hour Photography at ケープタウン

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

南緯33.9度のケープタウンは、12月の夏至に14時間25分の日照で祝います——アフリカ最南端の真夏です。二つの大洋（大西洋とインド洋）に挟まれた半島に位置するこの街では、太陽がインド洋から昇り、大西洋に沈みます——世界中の沿岸都市でもほんの一握りしか持たない稀有な地理的特権です。

UV Exposure & Sun Safety at ケープタウン

UV radiation at ケープタウン peaks when the sun is highest in the sky — around solar noon. At -33.9° 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 ケープタウン'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 ケープタウン

All solar calculations for ケープタウン 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 ケープタウン's coordinates (-33.9°, 18.4°) — zero server processing means your location data never leaves your device.