Twice a year for two consecutive days, the sun perfectly aligns with Manhattan's city grid and sets between the massive skyscrapers.

It's called Mahattanhenge (an allusion to Stonehenge) and it's kind of a big deal on Instagram.

Here's everything you need to know to capture the phenomenon:

When: Friday, May 29 and Saturday, May 30 at 8:12 pm EDT 

Where: The American Museum of Natural History suggests staying on the east side of town. The best cross streets include 14th, 23rd, 34th, 42nd, and 57th. The Chrysler building on 42nd and the Empire State Building on 34th are ideal vantage points. 

Whatever location you choose, arrive 30 minutes prior to 8:12 pm. If you miss it or the weather doesn't cooperate, don't fret: Manhattanhenge occurs again on July 12 and 13 at 8:20 pm. 

Here are a few Manhattanhenge pics to help inspire the perfect shot. 

SEE ALSO: A Ridiculously Cool Animated GIF Of Manhattanhenge

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