To the Editor:

Earth Day comes but once … no … twice a year—April 22nd and around March 20th, the equinox.

Both Earth Days were born in 1969, the year of Woodstock. Both became events in 1970, the year of Kent State and Apollo 13, for perspective.

The April Earth Day was introduced by US Senator Gaylord Nelson of Wisconsin. The equinoctial Earth Day was introduced by John McConnell, father of the Earth Charter.

The latest claim is that more than half a billion people participate in environmental awareness activities on one or the other or both Earth Days every year. Critics claim that Earth Day symbolizes the marginalization of environmental sustainability.

The United Nations adopted Earth Day in 1971 as an annual celebration of Spaceship Earth “as it continues to spin and circle in frigid space with its warm and fragile cargo of animate life.”

Just a quickie 'minder, lest we forget, or never knew … twice the Earth Days to celebrate … being the third planet from the one sun….