When Day Meets Night Cut Coin PendantThis design is inspired by two spacial days in a year. When day and night has exactly the same length. Spring equinox happens around 20 March (also known as the vernal equinox), and, for autumn, around 20 September. The precise timings vary slightly year to year. In the UK, Stonehenge is the most famous meeting point for druids and pagans, who gather annually to watch dawn break.