Night (also described as night time, night-time, or nighttime, unconventionally spelled as nite) is the period of ambient darkness from sunset to sunrise during each 24-hour day, when the Sun is below the horizon. The exact time when night begins and ends depends on the location and varies throughout the year, based on factors such as season and latitude.
The word can be used in a different sense as the time between bedtime and morning. In common communication, the word night is used as a farewell ("good night") and sometimes shortened to "night", mainly when someone is going to sleep or leaving. For example: "It was nice to see you. Good night!", unlike "good morning", "good afternoon", and "good evening", "good night" (or "goodnight") is not used as a greeting.Astronomical night is the period between astronomical dusk and astronomical dawn when the Sun is between 18 and 90 degrees below the horizon and does not illuminate the sky. As seen from latitudes between about 48.56° and 65.73° north or south of the Equator, complete darkness does not occur around the summer solstice because, although the Sun sets, it is never more than 18° below the horizon at lower culmination, -90° sun a angles occur at Tropic of Cancer on December Solstice and Tropic of Capricorn on June Solstice and at equator on equinoxes.
The opposite of night is day (or "daytime", to distinguish it from "day" referring to a 24-hour period). Twilight is the period of night after sunset or before sunrise when the Sun still illuminates the sky when it is below the horizon. At any given time, one side of Earth is bathed in sunlight (the daytime) while the other side is in the shadow caused by Earth blocking the sunlight. The central part of the shadow is called the umbra.
Natural illumination at night is still provided by a combination of moonlight, planetary light, starlight, zodiacal light, gegenschein, and airglow. In some circumstances, aurorae, lightning, and bioluminescence can provide some illumination. The glow provided by artificial lighting is sometimes referred to as light pollution because it can interfere with observational astronomy and ecosystems.

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  1. M

    Weather comp settings at night?

    Hi How does the weather comp. work when you go to bed. If you have a lower temperature at night surely the next day the boiler then has to work that bit harder to reach the correct temperature for that day. What do you do?
  2. M

    Water hammer at same time every night

    I wonder can anyone give me some advice over what has become a very annoying situation? Approximately three months ago, what I assume to be water hammer started in the airing cupboard of my second floor flat. This manifested, and continues to do so, as a repeated, i.e. every 60 seconds or so...
  3. Cherry28

    Boiler fails to come on at night….

    Boiler is a Fagor FEB- 20E UK ECOPLUS in a holiday home (static caravan). It has had a new thermostat fitted. We set it at 22c and switch the dial on the boiler to Winter, for the radiators. We do not use the timer as it should come on when it goes below set temperature. The problem is. It...
  4. J

    Banging walls in the middle of the night

    Hi, i’ve just recently moved into a house and in the middle of the night my cold water pipe constantly taps on the wall for a while is always at random times, will i have too pull my wall down to look for the pipe? Help i cant sleep cos of it lol
  5. eli-nathan

    Saniflo motor runs through the night

    Recently moved in to a flat and we have a Saniflo toilet in the ensuite. For a while it was okay but then it started running occasionally without being used. It has started running every hour or so through the night and it makes a huge noise so we just switched it off. After turning it off...
  6. S

    very bad grumbling noise in water pipes at night

    hi all, can you suggest what is wrong with my water pipes they all make a loud grumbling type of noise at night at random times. my hot water and central heating is off at night and not being used. i had a plumber call round yesterday but he said he does not know what the problem is. i said i...
  7. D

    Pump staying on at night. Faulty PCB relay or HPA2 m/switch - or ?

    Glowworm Ultimate 50FF + 2x Danfoss HPA2 valves for CH and HW. Pressurised system. No frost stat and wiring (S-plan – I think) has been OKd by two separate engineers. At the end of the day, the pump is not switching off when boiler/CH/HW shut down. After the 6-7 minute pump overrun, the levers...
  8. S

    Vaillant Ecotec Plus 430 - fan starts up briefly in middle of the night

    Hi, I wonder if anyone can help solve a mystery. I've a Vaillant Ecotec Plus 430 boiler (installed as an unvented system) that's about 3 years old and apparently working well. However, in recent months I've occasionally been woken by the boiler fan suddenly starting up in middle of the night...
  9. R

    Old boiler turning itself on at night

    Hi all, Strange query here...! I recently replaced my timer/programmer thanks to the help of folk on here. I now have a Drayton lifestyle 7 day programmer, a Honeywell junction box, and a very old but well serviced and working Potterton Kingfisher MF boiler. Recently (Not just when cold...
  10. P

    Hot water staying on all night despite controller being off

    Good Morning All, Further to my previous post about my pump running all night, I've now done some further investigation at 3am this morning and realised it's different than I originally thought. We have a Glow-worm Ultracom 30hxi boiler that feeds our central heating and hot water. It’s...
  11. A

    Ideal Logic heat 24 fan - cycles on and off all night (when in an off mode)

    Hi, I have an Ideal Logic Heat 24 boiler, but even when in off mode on the programmer, it constantly starts the fan up for a few seconds and then shuts down again. Any ideas please? Not good for light sleepers!
  12. A

    Ideal Vogue 32 turn off night running

    Complete beginner here. Just need a bit of advice, if you could help. My elderly parents recently had installed this combi. They really dislike it kicking in now and again at night. I've turned off the Frost Protection feature, but by design that doesn't stop it running a bit sometimes at...
  13. PriestyUK

    Van got done last night!

    Fuming, bloody van got broken into last night in the Premier Inn carpark in Tewkesbury! I came out this morning about 6:30 opened the sliding door to put my overnight bag in the back and thought F*CK me I left my van in a mess last night whilst packing up and then it dawned on me that I...
  14. H

    Night storage tank temperature problem?

    Hi, I was just wondering if someone can explain something to me as I am very much a layman in these things and very new to immersion heating/Economy 7 (I have just moved in to a new rented flat). I have an immersion tank with two cylinders: a top tank one for the 'boost' and the lower tank for...
  15. A

    Only luke-warm HW some mornings

    We have a standard boiler, and the HW is timed to come on for half an hour in the morning and half an hour early evening. This has always been more than enough, but since December there have been several days where the hot water has only been luke warm in the mornings. The only thing these days...
  16. S

    Loud noises coming from pipes in boiler cupboard at night

    Morning... I have a combi boiler and seem to be getting loud noises(not banging but high pitched horn sounding) coming from what seems to be the pipes. It happens during the day sometimes which is not so bad .. however it has now has started happening in the middle of the night. I am not using...
  17. D

    things that go bump in the night

    I have a Baxi solo 3 with cylinder in loft complete with three port valve every evening on several occasions a load banging noise comes from the loft. Plumber has replaced 3 port valve clipped all the pipework added a bypass before the three port and a new board in the boiler. Any idea as to...
  18. U

    Banging pipe when neither hot water or heating is on, please help

    I hope someone can help, we have a banging noise at night, it does happen during the day but other noises cover it up. we here a click from the kitchen and then a banging noise which you can here on the front wall of the house. the bang is evenly spaced apart with a bang every four seconds and...
  19. townfanjon

    Friday night drink lads ?

    I am hooked on this stuff, anybody care to join me ?
  20. S

    Technical certificate night courses northwest

    Do these even exist? I'm trying to find a night course to do a recognised plumbing technical cert, but there doesn't seem to be anything. I know most other trades offer night courses as an option but can't find anything with plumbing.
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