Moon Phases Visible from 東京

From 東京 at latitude 35.7°, 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, 東京's mid-latitude latitude affects the moon's maximum altitude in the sky. The moon can reach up to 82.9° altitude when crossing the meridian near summer solstice, and only 25.7° near winter solstice. This seasonal variation determines how high the moon appears above 東京's horizon and affects lunar photography planning.

東京のスカイラインからわずか60km西、奥多摩地域はボートル3〜4の空を提供し、晴れた夜には天の川が肉眼で見えます。世界最大級の都市圏で本物の暗い空にこれほど近いことは極めて稀であり、国立天文台三鷹キャンパスが公開観望会を通じて積極的に推進しています。

Moonrise & Moonset Times at 東京

The moon rises approximately 50 minutes later each day as seen from 東京. 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 東京's latitude (35.7°), 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 東京 using real-time ephemeris data.

東京・三鷹にある国立天文台は1878年以来天体を追跡し続けており、アジアで最も歴史のある継続的な天文学機関の一つです。その20cm屈折望遠鏡は1918年に小惑星「東京」を発見し、太陽塔望遠鏡は現在も大都市の中心から日々黒点活動を監視しています。

Moon Illumination & 東京's Dark-Sky Planning

For stargazing and astrophotography in 東京, 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 35.7° 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 東京.

Lunar Data Accuracy for 東京

MoonSync computes moon phase, illumination, moonrise/moonset times, and lunar age for 東京 using real-time ephemeris data. Phase illumination is accurate to ±1%. Moonrise and moonset times are calculated from 東京's precise coordinates (35.7°, 139.7°) 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.