what I'm curious about / don't yet know, is what is used to define the meridian of the solar coordinate system? Like, N/S is pretty obvious (either sun's N/S axis, or Earth's ecliptic plane, or something), but what's the Grenwhich observatory to locate 0° ?
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3/ ah > the primary direction (0° ecliptic longitude) points from the Earth towards the Sun at the vernal equinox of the Northern Hemisphere. https://en.wikipedia.org/wiki/Ecliptic_coordinate_system#Spherical_coordinates … ...so in 2 more days Earth will be sweeping through 0° solar ...oh, wait, no EQUINOX not SOLSTICE
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