Moon Phases Visible from Porto

From Porto at latitude 41.2°, 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, Porto's mid-latitude latitude affects the moon's maximum altitude in the sky. The moon can reach up to 77.4° altitude when crossing the meridian near summer solstice, and only 20.2° near winter solstice. This seasonal variation determines how high the moon appears above Porto's horizon and affects lunar photography planning.

Porto liegt in der südlichen Hälfte des Pfads der totalen Sonnenfinsternis vom 12. August 2026 — die Totalität wird etwa 1 Minute 45 Sekunden über der ikonischen Dom-Luís-I-Brücke und dem Douro-Tal dauern. Die engen Gassen des UNESCO-gelisteten Ribeira-Viertels werden in eine unheimliche Mittagsdunkelheit fallen, während der Mondschatten mit über 2.000 km/h vom Atlantik her landeinwärts rast.

Moonrise & Moonset Times at Porto

The moon rises approximately 50 minutes later each day as seen from Porto. 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 Porto's latitude (41.2°), 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 Porto using real-time ephemeris data.

Porto auf 41,2°N ist in atlantisches Licht getaucht — die berühmte goldene Nachmittagssonne, gefiltert durch maritimen Dunst, inspiriert seit Jahrhunderten Maler und Fotografen. Die nach Westen ausgerichtete Lage der Stadt an der Douro-Mündung bedeutet, dass jeder Sonnenuntergang ein Schauspiel ist, eingerahmt von Fluss, Ozean und den terrassierten Hügeln von Vila Nova de Gaia am gegenüberliegenden Ufer.

Moon Illumination & Porto's Dark-Sky Planning

For stargazing and astrophotography in Porto, 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 41.2° 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 Porto.

Lunar Data Accuracy for Porto

MoonSync computes moon phase, illumination, moonrise/moonset times, and lunar age for Porto using real-time ephemeris data. Phase illumination is accurate to ±1%. Moonrise and moonset times are calculated from Porto's precise coordinates (41.2°, -8.6°) 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.