It is worth stating this explicitly - NIST has in fact done the practical experiments to demonstrate time dilation at both 10ms⁻¹ relative velocity and 1m relat

It is worth stating this explicitly - NIST has in fact done the practical experiments to demonstrate time dilation at both 10ms⁻¹ relative velocity and 1m relative height in Earth's gravitational well: https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=905055 https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=90505...