Back طور كوكبي Arabic Fase planetària Catalan Φάσεις πλανητών Greek Fase planetaria Spanish گام سیارهای Persian Phase (astronomie) French Fase (planet) ID Fase (astronomia) Italian Fāze (astronomija) Latvian/Lettish Planetarisk fase NB
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A planetary phase is a certain portion of a planet's area that reflects sunlight as viewed from a given vantage point, as well as the period of time during which it occurs. The phase is determined by the phase angle, which is the angle between the planet, the Sun and the Earth.