Segundo

An Segundo amo an usa ka yano nga sukol han oras ha Kanasodnon Sistema han mga Panukol o SI (tikang ha Frinanses nga le Système international d'unités.

Mga sumpay ha gawas

Kitaa an second ha
Wiktionary, an gawasnon nga pagpurulongan o diksyunaryu.

• National Physical Laboratory: Trapped ion optical frequency standards Archived 2009-02-14 at the Wayback Machine.
• High-accuracy strontium ion optical clock; National Physical Laboratory (2005)
• National Research Council of Canada: Optical frequency standard based on a single trapped ion Archived 2008-03-14 at the Wayback Machine.
• NIST: Definition of the second; notice the cesium atom must be in its ground state at 0 K
• Official BIPM definition of the second
• The leap second: its history and possible future
• What is a Cesium atom clock? Archived 2009-02-20 at the Wayback Machine.