Editing Gravitational constant (section)

=== Natural units ===
Due to its use as a defining<!--sic in cited sources--> constant in some systems of [[natural units]],<ref>{{cite book |title=The Foundation of Reality: Fundamentality, Space, and Time |author1=David Glick |author2=George Darby |author3=Anna Marmodoro |edition= |publisher=Oxford University Press |year=2020 |isbn=978-0-19-883150-1 |page=99 |url=https://books.google.com/books?id=sqXaDwAAQBAJ}} [https://books.google.com/books?id=sqXaDwAAQBAJ&pg=PA99 Extract of page 99]</ref><ref>{{cite book |title=Relativistic Celestial Mechanics of the Solar System |author1=Sergei Kopeikin |author2=Michael Efroimsky |author3=George Kaplan |edition= |publisher=John Wiley & Sons |year=2011 |isbn=978-3-527-63457-6 |page=820 |url=https://books.google.com/books?id=uN5_DQWSR14C}} [https://books.google.com/books?id=uN5_DQWSR14C&pg=PA820 Extract of page 820]</ref> particularly [[geometrized unit system]]s such as [[Planck units]] and [[Stoney units]], the value of the gravitational constant will generally have a numeric value of 1 or a value close to it when expressed in terms of those units. Due to the significant uncertainty in the measured value of ''G'' in terms of other known fundamental constants, a similar level of uncertainty will show up in the value of many quantities when expressed in such a unit system.