First Day of Summer (Astrological)

First Day of Summer (Astrological) occurs on the same day as Summer Solstice. In 2018, this is June 21st.

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References:
calendar-updates.com/info/holidays/us/summer.aspx
huffingtonpost.com/news/first-day-of-summer/
metoffice.gov.uk/…/when-does-summer-start