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Time
This category is for questions about the methods humans go about measuring the passage of time. You can also find questions about converting one unit of time to another.
9,511 Questions
How do we measure the length of a year?
There are several different methods.
The solar year or tropical year is the time that it takes the earth to go from one vernal equinox to the next. This is the time, in March, when the sun appears to cross the celestial equator when its apparent motion is Northwards. This is 365 days 5 hours 48 minutes 46 seconds or 365.242189 days.
The sidereal year is the time taken by the Earth to go around the sun so that the sun is in the same position relative to distant stars in the background. The year, measured this way, is slightly longer since it is equals 365.25636 days. The difference, 20 minutes 24.5 seconds is due to the precession of the equinoxes. This is the main element of the slow and continuous change in the orientation of the earth's rotational axis caused by gravity.
How do you calculate a fraction of an hour?
The same as you calculate the fraction of anything. For example, a fifth of an hour is one part out of five equal parts of a whole hour.
How many hours is 11 30am to 3 30 pm?
The time from 11:30 AM to 3:30 PM is 4 hours. You can calculate this by counting the hours from 11:30 AM to 12:30 PM (1 hour), then from 12:30 PM to 1:30 PM (1 hour), from 1:30 PM to 2:30 PM (1 hour), and finally from 2:30 PM to 3:30 PM (1 hour). Adding these together gives a total of 4 hours.
How is the use of local time inconvenient in the practical life?
Strictly speaking, local time is when the sun is at its highest in the sky. This changes by an hour for every 1600 kilometres (1000 miles) at the equator and much less than that at higher latitudes. This is equivalent to a difference of 1 minute for every 26.67 km (16.67 miles) so that , for some of our larger cities, the time between end of the city and another would differ by a minute. In the modern world, where computers and satellites interact on time cycles which are considerably shorter, this would lead to chaos.
How many minutes are there from 148 PM to 636 PM?
There are 5 hours and 48 minutes between 1:48 pm and 6:36 pm.
What is 1254 in analogue time?
It is when the big hand on a clock face is at 54 and the little hand is a tiny bit short of 1 (27 degrees instead of 30 degrees).
How many minutes are in the time interval from 122 P.M. to 544 P.M.?
262
38 + 180 + 44 = 262
240 + 22 = 262
How many hours is 7.30 to 10.15?
From 7:30am to 10:15am is 2 hours and 45 minutes.
From 7:30am to 10:15pm is 14 hours and 45 minutes.
From 7:30pm to 10:15pm is 2 hours and 45 minutes.
From 7:30pm to 10:15am is 14 hours and 45 minutes.
How many hours is 7.30pm to 10.15pm?
the time between the to boundry value given, i.e 7:30 pm and 10:15 is more than 2 hours and less than 3 hours , to be more perfect it is 2 hours and 45 minutes or in minutes of time it will calculated to be about 165 minutes as 1 hour has 60 minutes
9:30am to 2pm is 4 hours and 30 minutes.
9:30am to 2am is 16 hours and 30 minutes.
9:30pm to 2am is 4 hours and 30 minutes.
9:30pm to 2pm is 16 hours and 30 minutes.
How long does it take for the minute hand on a clock to pass through 2.5 p radians?
1 radian = approx 9.5 minutes so 2.5 radians = 23.9 minutes. Therefore 2.5 p radians = 23.9p minutes.
