Assertion: leap year's day | /r/HasAspect | 86,400 seconds
Facets:
Source sentences:
text: A normal day has 86,400 seconds, but in the atomic time scale 1 second is not defined as one 86,400th of the time it takes Earth to rotate around its axis but rather as the time it takes a Cesium-133 atom at the ground state to oscillate precisely 9,192,631,770 times.