$11^{th}$ February
The United Nations designates specific days to celebrate and raise awareness about important global issues. The International Day of Women and Girls in Science is one such observance.
This significant day is observed annually on February 11th. It aims to promote full and equal access to and participation in science for women and girls.
Therefore, the correct observance date is $11^{th}$ February.
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The United Nations proclaimed 21 st June as