Moon Phases Visible from ケープタウン

From ケープタウン at latitude -33.9°, the moon's appearance follows the same 29.53-day synodic cycle visible worldwide — all 8 phases from New Moon through Full Moon and back. However, ケープタウン's mid-latitude latitude affects the moon's maximum altitude in the sky. The moon can reach up to 84.7° altitude when crossing the meridian near summer solstice, and only 27.5° near winter solstice. This seasonal variation determines how high the moon appears above ケープタウン's horizon and affects lunar photography planning.

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。

Moonrise & Moonset Times at ケープタウン

The moon rises approximately 50 minutes later each day as seen from ケープタウン. This daily delay occurs because the moon orbits Earth eastward at about 1 km/s, moving roughly 13° per day against the background stars. At ケープタウン's latitude (-33.9°), the moon's rise and set positions along the horizon shift seasonally — rising further north in summer and further south in winter. MoonSync calculates exact moonrise and moonset times for ケープタウン using real-time ephemeris data.

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。

Moon Illumination & ケープタウン's Dark-Sky Planning

For stargazing and astrophotography in ケープタウン, moon illumination percentage is the critical number. A Full Moon (100% illuminated) washes out all but the brightest stars and makes deep-sky observation nearly impossible. The 7 days around New Moon (0-15% illumination) provide the best dark-sky window. At -33.9° latitude, combine moon phase with the Twilight Calculator to find nights when both astronomical darkness and minimal moonlight coincide — these 'astrophotographer's golden hours' occur roughly once per month at ケープタウン.

Lunar Data Accuracy for ケープタウン

MoonSync computes moon phase, illumination, moonrise/moonset times, and lunar age for ケープタウン using real-time ephemeris data. Phase illumination is accurate to ±1%. Moonrise and moonset times are calculated from ケープタウン's precise coordinates (-33.9°, 18.4°) and corrected for atmospheric refraction. The Keplerian orbital model used achieves timing accuracy of approximately ±30 minutes over a synodic month. For sub-minute lunar event timing, consult the USNO Phases of the Moon data service.