About World Metrology Day
World Metrology Day is an annual celebration of the signature of the Metre Convention on 20 May 1875 by representatives of seventeen nations.
The Convention set the framework for global collaboration in the science of measurement and in its industrial, commercial and societal applications. The original aim of the Metre Convention - the world-wide uniformity of measurement - remains as important today as it was in 1875.
Similar Observances
National Space Day
National Space Day, an out-of-this-world celebration and is always celebrated on the first Friday in May.
Read More
Read More
Other Observances on May 21st 2025
International Customer Support Day
Customer support staff are there to give us all a helping hand, so on the third Wednesday in May take a moment to thank them.
Read More
Read More
