This was
your sky.
Sakurajima Volcano with Lightning
Lightning can strike during a volcanic eruption, as seen here at Japan's Sakurajima volcano in 2013. Hot magma and ash burst through the Earth's surface, creating a turbulent cloud. The exact cause of volcanic lightning is still a subject of research, but it is thought to involve charge separation within the ash plume, similar to how regular thunderstorms generate lightning.
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In tropical astrology, 13 MAY 2018 falls under Taurus (♉). The sign's window runs from 04-20 through 05-20. Taurus holds the Pleiades star cluster and Aldebaran, the red giant that marks the eye of the Bull. The Sun was crossing this region of the sky on 13 MAY 2018.