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night

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

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  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...
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    • Forum: USA
  6. S

    very bad grumbling noise in water pipes at night

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  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. S

    Ideal Logic & Logic + firing in the night?

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  10. O

    UFC this night..... .....

    Hi lads anyone watching the fight tonight? If, who are you supportuje and why? I am supporting khabib. I do not like the arrogant Damn due to his personality. I think in a certain age you should be grown and have some sort of respect towards other people and countries. Especially, he has got a...
  11. R

    Old boiler turning itself on at night

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  12. P

    Hot water staying on all night despite controller being off

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  13. hammers4spanner

    Last night apprentice

    Woman on it who had a business plan of getting trades work. Yet another one pay 4 k a year to her business and she will get you leads . I can' stand these leeches
  14. Harvest Fields

    Friday night and it is sooooo cold!

    So, what is everyone doing to night? I am here!!:oops::oops::oops:
  15. 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!
  16. M

    Fancy a UKPF night out in Wales??

  17. R

    Black Friday, Sunday night edition. The final countdown!

    Here we go... Before we start, we are now out of all promotional Ideals, so no more goodies there. We are out of Ecotec Pro 28s, and the other Vaillants are thinning out rapidly - we will have to take down several more models in the next hour or so. Intergas Rapids sold out very early, but...
  18. R

    Black Friday 2016 - Saturday night fever

    Evening all! And we start off tonight with a price plunge on the Worcester 29 CDI. We have a limited number, but will cut the price every few minutes until they sell out. Obviously, the longer you leave it, the cheaper it will get, but what if someone swoops in an buys them all before it...
  19. jonnyswamp

    Something to cheer you up on a school night

    Simply 21 brilliantly funny readers? letters to Viz magazine | The Poke A couple even made I chuckle out loud
  20. A

    Ideal Vogue 32 turn off night running

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