Sightseers in New York enjoyed an extra-special view at the weekend as the sun set on the city's iconic skyline.
Twice a year the sun's descent to the horizon is perfectly framed by the skyscrapers lining the city's grid-like east-to-west streets, which are lit up by the phenomenon.
The celestial vision towards the Hudson River is referred to as "Manhattanhenge", in tribute to Stonehenge's standing stones and their ancient alignment to the sun.
The sight brings tourists and New Yorkers racing into crossings when the traffic lights turn red to capture the fiery orb in the sky on camera.
The semi-annual sunset is followed by a full "super moon", whose increased size comes as the moon's orbit passes closer to the Earth than usual.
The Manhattanhenge term was coined by astrophysicist Neil DeGrasse Tyson, although the dramatic fall of the sun amid a high-rise environment is not exclusive to New York City.
It is also celebrated in other US cities like Chicago and Baltimore and Canadian cities Toronto and Montreal.