Today we will discuss about the physical quantity – TIME.
It the most important physical quantity because we are consciously, sub-consciously even un-consciously we are calculating time. In this blog we will try to give you a rough idea about time
Earth possesses two kinds of motions, one of them is rotational motion.
The rotational motion from west to east on the geographical axis is called the diurnal motion, which causes day and night.
When the sun attains the highest position in the celestial sphere, it is said to be on the meridian.
The interval of time between any two successive passage of the sun across the meridian is called an apparent solar day.
But for the same reasons, on measuring the lengths of the apparent solar day for some consecutive days, we see it is not constant but it varies slowly.
The average taken over a year is known as a mean solar day.
A mean solar day has 24 hours
1/24 th part of it is an hour
1/60 th part of an hour is a minute
1/60 th part of a minute is a second
Therefore, 1/86400 th part of a mean solar day is a second
1 decade = 10 years
1 century = 10 decades = 10 x 10 years = 100 years
1 millennium = 10 centuries
The units of time
In CGS system: second
In FPS system: second
In MKS system: second
Instruments for measuring time
Clock and watches
Formats of Clock
12 – hour format, which we are used to
24 – hour format, which is used in the Airports and railway stations to avoid confusions
So, What is TIME ?
Time is the interval between two events.
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