This one was seen from automatic gas station lights. The helic arc is
rises diagonally from the lamp. I was desperately looking for a place
for the spotlight, but the surroundings were totally light polluted.
Just 300-400 meters away it was totally dark wilderness, though, but the
diamond dust never reached there. So I just photographed the halos in
this light. I walked closer to see if I could see 3D structure in helic
arc, but as expected, it disappeared. The tangent arc had no seagull
shape at the appropriate lamp elevation, indicating presence of Parry
arc, which certainly was there. The helic arc is doubled because there
are two lights.
Original post in Submoon
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