Google marks the first day of spring by changing its logo. In recent years Google was used to doodle Nowruz (Persian New Year) by changing the logo of its Persian version of Google homepage, i.e.
https://www.google.com/webhp?hl=fa, but this year it seems that the Google Doodle Team has decided to be more general to mark vernal (spring) equinox, but not to mark Nowruz that can be disappointing for some Persians / Iranians like me 
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