A Sekund oda Sekundn is de Basisoaheid vo da Zeid im internationain Oaheidnsystem (SI).
A Sekund dauad eppa an Heazschlog lang.
A Stund hod 60 Minutn und a Minutn hod 60 Sekundn. Friacha hod ma a Sekundn nochn middlan Sunnadog definiad. Ob anno 1960 ois Epfemeridnsekund iba de Daua vo an tropischn Joar.
Seit 1967 gibts de Atomsekund. De is definat ois as 9 192 631 770-foche vo da Periodndaua vo da Strohlung, de wo en Ibagang zwischn de boadn Hyperfeinstruktuaniveaus vom Grundzuastan vo de Atome vom Nuklid Caesium-133.
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