Fixed numerical value of Planck's Constant defining a Joule second, together with a metre and second
The platinum alloy block has served as the standard in one form or the other since 1799, the water definition being the standard before then. However, the platinum artefact changes over time. With increasing refinement of measuring capacity Planck's Constant is now able to be fixed and serves as an unvarying definition and one widely available.
What island group may be described as a triangle with its corners at Hawaii, New Zealand and Easter Island, including the island groups Samoa, Tonga, the Cook Islands, Tuvalu, Tokelau, and Niue?