Because of the difference between daytime and nighttime propagation conditions, it has been necessary to evolve different allocation structures for daytime and nighttime broadcasting in the AM band, with many more stations operating during the day than at night.

According to Atanasoff's account, several key principles of the Atanasoff – Berry Computer were conceived in a sudden insight after a long nighttime drive during the winter of 1937 – 38.

The minimum weather conditions for ceiling and visibility for VFR flights are defined in FAR Part 91. 155, and vary depending on the type of airspace in which the aircraft is operating, and on whether the flight is conducted during daytime or nighttime.

Solar energy is equally not available on cloudy days and during the nighttime, so stored energy must be available to compensate for the loss of sunlight.

In 1997, after his sponsorship with Coca-Cola ended, NASCAR driver Jeff Gordon signed a long term contract with Pepsi, and he drives with the Pepsi logos on his car with various paint schemes for about 2 races each year, usually a darker paint scheme during nighttime races.

Other than the heat retention properties of urban areas, the nighttime maximum in urban canyons could also be due to the blocking of " sky view " during cooling: surfaces lose heat at night principally by radiation to the comparatively cool sky, and this is blocked by the buildings in an urban area.

The nighttime effect of UHIs can be particularly harmful during a heat wave, as it deprives urban residents of the cool relief found in rural areas during the night.

There were reports that the number of residents increased by 60 % during the 1990s to about 25, 000 although a second estimate ( based on the 2000 census based on a different map ) places the residential ( nighttime and weekend ) population in 2000 at 12, 042.

Sleep studies using polysomnography have suggested that people who have sleep disruption have elevated nighttime levels of circulating cortisol and adrenocorticotropic hormone They also have an elevated metabolic rate, which does not occur in people who do not have insomnia but whose sleep is intentionally disrupted during a sleep study.

Examples of such environmental modifications include using the bed for sleep or sex only, not for activities such as reading or watching television ; waking up at the same time every morning, including on weekends ; going to bed only when sleepy and when there is a high likelihood that sleep will occur ; leaving the bed and beginning an activity in another location if sleep does not result in a reasonably brief period of time after getting into bed ( commonly ~ 20 min ); reducing the subjective effort and energy expended trying to fall asleep ; avoiding exposure to bright light during nighttime hours, and eliminating daytime naps.

These incendiary bombs were utilized primarily during nighttime air raids.

Monthly averages range from in January to, though differences between daytime and nighttime temperatures are significantly greater during summer than in winter.

In September 1924, Marconi transmitted during daytime and nighttime on 32 meters from Poldhu to his yacht in Beirut.

Searchlights were used extensively in defense against nighttime bomber raids during World War II.

" In the same episode, Marge and Ruth Powers elude Wiggum during a nighttime car chase by turning off the lights on their car, leading Wiggum to exclaim, " It's a ghost car!

Outside of daytime programs for children, the network also aired movies and original specials ( largely concert specials ), primarily during the nighttime hours.

* Disney Nighttime – From 1983 to 1997, Disney Channel, during the premium channel era featured programming aimed at adult audiences, during the nighttime hours under the banner name " Disney Nighttime "; unlike the nighttime content aired on the channel's then-competitor premium channels at the time of its launch, the " adult " programming featured on Disney Channel was devoid of sexual and violent content.

The channel's target audience was children ages 2 – 12, and children ages 7 – 14 during its nighttime block called Jetix.

215 episodes daytime, 18 episodes on Match Game PM ( nighttime ), and 15 episodes during the syndicated version.

`` All right, if you can't do your arithmetic during school hours you can do it after school is out '', Miss Langford said firmly, not smiling.

However, last night the tapes were not run at all during the evening hours and all we got on TV were a few snatches which Douglas Edwards and Huntley and Brinkley could squeeze into their programs.

The radio stations did run `` transcripts '' ( I thought ) during the evening hours.

It also happened with the Inauguration, which was not re-run at all during the evening hours, and I wrote to the TV editor of the Times.

but during the middle daytime hours these skywave radiations are not reflected in any substantial quantity, and during this portion of the day both skywave service and skywave interference are, in general, negligible.

during the same period around sunrise, skywave transmission is declining, until at about 2 hours after sunrise it reaches a point where it becomes of little practical significance.

Essentially, the question presented for decision in the present Daytime Skywave proceeding is whether our decision ( in 1938-1939 ) to assign stations on the basis of daytime conditions from sunrise to sunset, is sound as a basis for AM allocations, or whether, in the light of later developments and new understanding, skywave transmission is of such significance during the hours immediately before sunset and after sunrise that this condition should be taken into account, and some stations required to afford protection to other stations during these hours.

In 1947, affidavits were filed with the Commission by various clear-channel stations alleging that extensive interference was being caused to the service areas of these stations during daylight hours, from class 2, stations whose signals were being reflected from the ionosphere so as to create skywave intereference.

during daylight hours their brilliant colors command attention and interest.

In this instance, there was a dosage of 562 during the first two hours and a total dosage of 1980 for the four-hour period, a four-fold increase.

A hebephrenic man used to give a repetitious wave of his hand a number of times during his largely-silent hours with his therapist.

Susie may wear this only at night or for a few hours during the day.

But she does indicate festivities will start early, that a jazz combo will `` give with the Basin Street beat '' during the cocktail and dinner hours and that Lester Lanin's orchestra will take over during the dancing.

Louis Glazer is chairman of the men's committee that, among other jobs, takes over part of the responsibility for staffing the shop during its evening hours.

The north-bound entrance to the Expressway at 14th Street will be closed during the afternoon rush traffic hours this week.

Incidentally, 14th Street and the Expressway is the high accident intersection during daylight hours.

Some churches have six or more training sessions of two hours each, generally held on Sunday night or during the week.

And the hours were six-thirty in the morning until eleven at night on Saturdays and during sales, and there were no chairs and you couldn't smoke and the cooling was overhead fans and there was no porter or janitor.

The usually nocturnal Cuban tree frog ( Osteopilus septentrionalis ) produces a rain call when there is rainfall during daylight hours.

If a U. S .- based team ( located in either Boston, Chicago, Detroit or New York City ) was playing in Toronto on a particular Saturday night, thousands of fans in the U. S. city whose local team faced the Leafs would often listen to the CBC broadcast via skywave reception, with the game often drawing far more listeners during the HNIC broadcast period than any local station.

However, after sunset, changes in the ionosphere cause MF signals to travel by skywave, enabling radio stations to be heard much farther from their point of origin than is normal during the day.

In the United States, there are six " Local Channel " frequencies, also known as " graveyarders " where nearly every station on those frequencies has the same power and antenna pattern both day and night and, as a result of skywave propagation, there is normally massive co-channel interference in rural areas on these frequencies, often making it difficult, if not impossible, to understand what's being said on the nearest local station on the respective channel, or the other distant stations which are bouncing on the same channel, during the nighttime hours.

Radio waves ( black ) Reflection ( physics ) | reflecting off the ionosphere ( red ) during skywave propagation.

As a result of skywave propagation, a broadcast signal from a distant AM broadcasting station at night, a shortwave radio station or ( during sporadic E season ) a low band TV station can sometimes be heard as clearly as local stations.

It is beamed at 96 degrees ( i. e. east ) and was originally mainly intended for night-time ( skywave ) coverage of Poland, Czechoslovakia, Hungary and the western USSR, key target areas for the BBC during the Cold War.