The word day has a number of meanings, depending on the context it is used such as of astronomy, physics, and various calendar systems.
As a term in physics and astronomy it is approximately the period during which the Earth completes one rotation around its axis, which takes about 24 hours. A solar day is the length of time which elapses between the Sun reaching its highest point in the sky two consecutive times. Days on other planets are defined similarly and vary in length due to differing rotation periods, that of Mars being slightly longer and sometimes called a sol.
The unit of measurement "day" (symbol d) is defined as 86,400 SI seconds.
The second is designated the SI base unit of time. Previously, it was defined in terms of the orbital motion of the Earth in the year 1900, but since 1967 the second and so the day are defined by atomic electron transition.
A civil day is usually 24 hours, plus or minus a possible leap second in Coordinated Universal Time (UTC), and occasionally plus or minus an hour in those locations that change from or to daylight saving time. Day can be defined as each of the twenty-four-hour periods, reckoned from one midnight to the next, into which a week, month, or year is divided, and corresponding to a rotation of the earth on its axis. However, its use depends on its context; for example, when people say 'day and night', 'day' will have a different meaning: the interval of light between two successive nights, the time between sunrise and sunset; the time of light between one night and the next. For clarity when meaning 'day' in that sense, the word "daytime" may be used instead, though context and phrasing often makes the meaning clear. The word day may also refer to a day of the week or to a calendar date, as in answer to the question, "On which day?"
The biologically determined living patterns (circadian rhythms) of humans and many other species relate to Earth's solar day and the day-night cycle.

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  1. S

    Klindex 1 day Stone cleaning and restoration course

    I attended the Kilndex stone polishing and restoration course run by Amir Patwa today and just wanted to say a big thank you to him and his assistant for putting on this free days training. Amir is a really nice guy with a great sense of humour and explained the basics of marble and stone...
  2. Andy Allen

    A very sad day...

    just sold my beloved motor bike.... all my mates i used to go out with, sold there bikes, and it wasn't much fun going out on my own, so i wasnt using it as much as i would of liked to, so i made my mind up to sell it.....could of cried when the bloke picked it up this evening still might...
  3. I

    Productive Day Off

    Day off today :hurray: managed two outings in the country side ! This mornings outing produced and this evenings outing produced these 4 biggest being 4lb 6oz Good day had by all,Just cant make mind up on whats tomorrows T !!!
  4. E

    Fathers Day.

    My eldest daughter has gone away this weekend, but gave me this for Fathers Day :lol:
  5. D

    10 day SALE!! at ITS tools..

    Some bargains to be had in the 10 day sale at ITS tools.. >>>>>> Sale - 10 Days Only - Misc - ITS Boys and their toys :drool5:
  6. S

    Day off

    Ordered Granite tiles from Topps on Saturday & got told my order will be in Wednesday (yesterday). Wife goes to store & gets told orders not in yet. She fones store at 4 bells to be told order won't be coming at all as they are out of stock in the warehouse & closest store pick up is Wishaw...
  7. P

    Day rate

    When going to look at jobs do you go in on a day rate or metre rate
  8. D

    Great day today !

    in the pool at Stroud , scratch coated all the walls on my own ! had the digger drop sand/cement in the pool and mixed-up on my own and spread on my own , well with radio 2 and plenty of drinks it's been very hot there today !:thumbsup:
  9. D

    Just one spray a day.

  10. L

    Council bashing Day 1

    Getting quiet for at the moment so took couple of 3 weeks of "high end":lol: work for local council.My first kitchen today OMG:mad2: What a poo!!!!!! Pooooooooooooor prep ................ mean no prep:yikes: Thinking of taking shovel tomorrow instead of trowel. Just wonder if any of you fellow...
  11. D

    Happy St George's day today folks !

  12. G

    Happy St Georges day

  13. G

    Its a glorious day

    Sun is shining and the sky is blue, ok so i have to work a few hours but there's a nice drive in the countryside thrown in and money at the end of the job. Winter has been here too long, lets hope we have some great weather to make up for it now.
  14. P

    had a bad day!!!!

    Evening all....... went to my job in Notting hill disaster!!!!..........hheheheheheheee the architect decided that my "mat well" was too large.......I always make them the size of the swing of the door..........(open the door fully and make a mark!).......I thought this...
  15. Stu Lilley

    Schluter open day

    Just like to say a big thank you to Schluter for hosting an open day at Lilley Tile and Stone on Tuesday 16th April... on site training and demos on Bekotec and Kerdi wet rooms were enjoyed by all that attended.. Hats of to you all Fantastic new product which you informed us about,,,,cant...
  16. D

    First day back

    My first day back working for 6 weeks today ( after braking my foot) 7.5 m kitchen with 4 inch tiles and now I am tired foot is killing but good to be working agian
  17. D

    NUFC v SAFC....Derby day!!!!! Sunday..

    Well if we play like thursday night... it will be a mahoooosive score for the Toon...:smilewinkgrin:... But if all else fails Bring on the >>>>>>>>
  18. AliGage

    Free one day courses

    Guys, I've seen the workshops offered by Impey and Schulter on here and i'm looking to get myself booked on these as soon as possible. Is there any others on offer that you guys are aware of that might be beneficial?
  19. D

    What is your choice of slurp on this damn fine sunny day..

    Been a lovely sunny day today .... so back home and opened a nice cold one... :8: What you supping toneet..?
  20. CJ

    Day Off. :(

    Driver awareness course this afternoon. That'll teach me not to get too excited, after dropping my wife off for a flight. The thought of having the house to myself was too much, that I exceeded the speed limit by 5 chuffing miles, and got zapped:thumbsdown:
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