Dawn — A time that marks the beginning of the twilight before sunrise. It is recognized by the presence of weak sunlight, while the sun itself is still below the horizon.
Sunrise — The moment when the top of the sun disc touches the horizon on sunrise.
Solar noon — The moment when the sun appears the highest in the sky, compared to its positions during the rest of the day.
Sunset — The moment when the top of the sun disc touches the horizon on sunset.
Dusk — A time that marks the end of the twilight after sunset and the beginning of darkness in the evening.
Sun path refers to the daily and seasonal arc-like path that the Sun appears to follow across the sky as the Earth rotates and orbits the Sun. You can display here the sun direction and the sunny hours in Porto (Portugal. Accurate location-specific knowledge of sun path and climatic conditions is essential for economic decisions about solar collector area, orientation, landscaping, summer shading, and the cost-effective use of solar trackers. Enjoy !