I'm glad that there are many atmospheric phenomena on our planet, otherwise it would be much more boring to live. Really, can you imagine a world without a rainbow, fog, lightning, dawn, aurora borealis? So the halo is one of those little miracles that are nice to admire. I rather often saw the solar halo, but sometimes the moon one also happens.
It's better to watch the photo in high resolution.
OLYMPUS E-M1 Mark II
Exposure time: 20 sec
Sensitivity: ISO 500
Focal length: 7.5mm
35 mm equivalent: 15 mm
You can also see my photos in my blog LJ and in my profile on NatGeo