the first international earth day occurred in 1971.
when did the first international earth day occur?
1971
following the success of the first earth day, hayes founded the earth day network and served as international chairman for earth day's anniversaries in 1990 and 2000. internationally, he is recognized for expanding the earth day network to more than 180 nations. it is now the world’s most widely observed secular holiday. hayes continues to chair the board of the international earth day network and is the chair of the earth day 2010 global advisory committee.





























section::::career.
denis hayes
international earth rotation and reference systems service





























the international earth rotation and reference systems service (iers), formerly the international earth rotation service, is the body responsible for maintaining global time and reference frame standards, notably through its earth orientation parameter (eop) and international celestial reference system (icrs) groups.





























section::::history.
international earth rotation and reference systems service