Imports github.com/sixdouglas/suncalc gonum.org/v1/gonum/spatial/r3 gonum.org/v1/plot gonum.org/v1/plot/palette gonum.org/v1/plot/plotter gonum.org/v1/plot/vg gonum.org/v1/plot/vg/draw gonum.org/v1/plot/vg/vgimg Standard library imports bytes crypto/sha256 encoding/binary encoding/gob encoding/hex fmt image/color io log math os os/exec path/filepath sort strings text/template time