This is the only day of the year when some people think of Earth. The date was chosen in the first trimester of spring to celebrate rebirth both of Earth and hope. World Environment Day and Arbor Day are the only others. Ground Hog Day fits as well.
What fascinates me is how many “days” there on the annual calendar that celebrate human days. Here is the list:
Mothers day Fathers Day Memorial Day Labor Day Thanksgiving Christmas Valentines Veterans St. Patricks
Universal Childrens World AIDS Pearl Harbor Remembrance Human Rights Bodhi Religious Freedom New Years Freedom Martin Luther King Holocast April Fools International Womans Womans Equal Rights May Anzac Bike to Work Victoria Armed Forces St Jean Baptist World Refuge Canada Independence Bastille Indiginous Peoples United Nations All Saints Patriot World Suicide Prevention Grandparents International Day of Peace Constitution Citizenship World Teacher National Coming Out World Mental Health Election International Day for Elimination of Violence Against Women Human Rights Bill of Rights National Wear Red Presidents Leap Read Across America World Autism Paraprofessional Appreciation World Health National Library Workers Workers Memorial National Teachers National Nurses Flag Parents World Population ( and probably others)
