Been fascinated by this for decades and honestly the "landing strip" crowd miss the more interesting explanation entirely. The astronomical alignment evidence is solid - Phyllis Pitluga's work connecting the spider glyph to Orion's Belt alone should have settled half the argument.
But what gets me is the ley line angle. These lines don't just point at stars, they follow geomagnetic currents running through the Nazca plateau. I've walked similar energy pathways here in Scotland and there's a quality to that ground that's hard to explain but immediately recognisable if you know what you're feeling for.
A seasonal calendar makes complete sense if you think of the whole plateau as a living ritual landscape rather than just a diagram. Pilgrims walking the lines at specific times, the geometry activating something in the landscape itself at solstices or equinoxes.
What's everyone's take on the water table theories? Some researchers reckon the lines trace underground aquifer routes and the whole thing is an integrated system. Would love to know if anyone's looked into that seriously.