My Vernal Equinox T-Shirt

An equinox is commonly regarded as the instant of time when the plane of Earth's equator passes through the centre of the Sun. This occurs twice each year: around 20 March and 23 September. In other words, it is the moment at which the centre of the visible Sun is directly above the Equator. You could only wear it once a year, on the Vernal Equinox (vernal means relating to spring), but why not? It is a special day, so it deserves a special design! The 'O' in equinox is made from the 'yin-yang' symbol, and it symbolises the balance between day and night! BTW you may edit the "my vernal" text to turn this into an Autumnal Equinox T-shirt!