A line-up of celestial bodies is called a Syzygy. It has other meanings too all of which are snuck in to Michael G Coney's novel of the same name which is part of a series which I commend even to dogmatic SF haters
I saw four lined up years ago and it was completely mind blowing (I was high as a kite and that may have had something to do with it). I got such a sense of my "place" in relation to the universe.
Be aware it can make you feel very small. For me, it was in a good way.
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Be aware it can make you feel very small. For me, it was in a good way.