astrophysicist neil degrasse tyson came up with a name for what happens every year, siml ar to the annlstice sighting at england's stonehenge. he dubbed "manhattanhenge." >> since we learned about the phenomenon, since neil degrasse tyson named it, we've been folling it. and so, we've been trying to time trips to be here when it happens. >> sreenivasan: this year's view did not disappoint. >> we were here three years ago, and we didn't get a successful sunset. was just cloudy right a the... right at the last moment. but tonight, it was pretty good. >>reenivasan: the next manhattanhenge won't occur until the spring of 2020, weather permitting. >> sreenivasan: finally tonight, for the first time since 1965, egypt opened two of its oldest pyramids to visitorsoday. the two pyramids are part of a world heritage site about 25 miles south of cairo. archaeologists say they also recently uncovered evidence of hidden tombs there, and plan tox begin new cavations next month. a that for this edition of pbs newshour weekend. i'm hari sreenivasan. thanks for watching. have a good night. captioning sponsor