Today is the spring equinox
Today - 20 March - is the spring equinox. The Sun passes over the equator at 1732Z.
Astronomically, this represents the first day of spring - but, meteorologically, spring started on 1 March.
The Sun reaches its highest northerly point at 1128Z on 21 June - the summer solstice - and will again cross the equator going south at the vernal equinox - 0309Z on 23 September.
And Europe, including UK, changes local time to Summer Time at 0200Z on 28 March. We all add one hour, to make UK work to BST (or 'A') time. Clocks move back (to GMT or 'Z' in UK) on 31 October.
Details from the NMM . .