The summer solstice, First Day of Summer occurs exactly when the Earth's axial tilt is most inclined towards the sun. Though the summer solstice is an instant in time, the term is used colloquially to refer to the day on which it occurs.
The summer solstice occurs some time between June 20 and June 21 in the Northern Hemisphere. Worldwide, interpretation of the event has varied from culture to culture, most have held a recognition involving holidays, festivals, gatherings, rituals or other celebrations around that time.
The word solstice derives from Latin sol (sun) and sistere (to stand still).
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TEXT RESOURCE: Summer solstice From Wikipedia