On Sunday, May 31, Shanghai gets a rare Blue Moon, with the exact full moon moment happening at around 4:45am. No, it won't actually turn blue. A Blue Moon is simply the name for the second Full Moon in the same month, something that only happens every few years.

Unless you're planning a very committed early-morning rooftop mission, you don't need to set an alarm for 4:45am. The better viewing time is actually around sunset and early evening on May 31, when the Moon rises low over the city and appears much larger next to buildings and the skyline.

Bonus astronomy trivia: this one is also a Micromoon, meaning the Moon will be slightly farther away from Earth than usual and appear a little smaller. You probably won't notice the difference, but it's still a good excuse to end up on a rooftop with a drink and look up.

Photographers: Huangpu riverside views, skyline spots, and rooftops are your friend.