Moon Phases Visible from ソウル

From ソウル at latitude 37.6°, 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, ソウル's mid-latitude latitude affects the moon's maximum altitude in the sky. The moon can reach up to 81.0° altitude when crossing the meridian near summer solstice, and only 23.8° near winter solstice. This seasonal variation determines how high the moon appears above ソウル's horizon and affects lunar photography planning.

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。

Moonrise & Moonset Times at ソウル

The moon rises approximately 50 minutes later each day as seen from ソウル. 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 ソウル's latitude (37.6°), 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 ソウル using real-time ephemeris data.

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。

Moon Illumination & ソウル's Dark-Sky Planning

For stargazing and astrophotography in ソウル, 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 37.6° 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 ソウル.

Lunar Data Accuracy for ソウル

MoonSync computes moon phase, illumination, moonrise/moonset times, and lunar age for ソウル using real-time ephemeris data. Phase illumination is accurate to ±1%. Moonrise and moonset times are calculated from ソウル's precise coordinates (37.6°, 127.0°) 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.