- published: 22 May 2016
- views: 1809
The second (SI unit symbol: s) is the International System of Units (SI) base unit of time and also a unit of time in other systems (abbreviated s or sec). Between 1000 (when al-Biruni used seconds) and 1960 the second was defined as 1/86,400 of a mean solar day (that definition still applies in some astronomical and legal contexts). Between 1960 and 1967, it was defined in terms of the period of the Earth's orbit around the Sun in 1900, but it is now defined more precisely in atomic terms. Seconds may be measured using mechanical, electric or atomic clocks.
However, 19th- and 20th-century astronomical observations revealed that this average time is lengthening and thus the sun–earth motion is no longer considered a suitable basis for definition. With the advent of atomic clocks, it became feasible to define the second based on fundamental properties of nature. Since 1967, the second has been defined to be:
SI prefixes are frequently combined with the word second to denote subdivisions of the second, e.g., the millisecond (one thousandth of a second), the microsecond (one millionth of a second), and the nanosecond (one billionth of a second). Though SI prefixes may also be used to form multiples of the second such as kilosecond (one thousand seconds), such units are rarely used in practice. The more common larger non-SI units of time are not formed by powers of ten; instead, the second is multiplied by 60 to form a minute, which is multiplied by 60 to form an hour, which is multiplied by 24 to form a day.
i'll stick to your heart
straight to your heart
i can't get to your heart
she said five seconds and you're high
straight to your heart
i can't get to your heart
thinking bout the right time
talk in your head,
to be mine
give you a sign
i don't believe in you
you don't believe in me
so how could you make me cry
five seconds to your heart
straight to your heart
i can't get to your heart
there's no way to get iron
five seconds to your heart
straight to your heart
i can't get to your heart
five seconds to your heart s
traight to your heart
i can't get to your heart
she said five seconds in your heart
straight to the heart
i can't to your heart
you keep loosing on
on a stream
could you feel
when it comes it sounds like
and when it comes we kiss
when it comes it sounds like
and when it comes we kiss
five seconds in your heart
straight to the heart
i can't get to your heart
she said five seconds in your heart
i can't get to your heart
that's no way to get it on
five seconds in your heart
straight to the heart i can't to your heart
i'm not trying to make you cry
i don't believe in you
you don't believe in me
so how could you make me cry
that's no way to get it on
i don't know why
but i'm not trying to make you cry
five seconds in your heart
straight to your heart
i can't get to your heart
five seconds in your heart
straight to the heart
i can't get to your heart
that's no way to get it on i don't know why
but i'm not trying to make you cry
five seconds in your heart
straight to your heart
i can't get to your heart
five seconds in your heart
straight to the heart