twilight, period between sunset and total darkness or between total darkness and sunrise. Total darkness does not occur immediately when the sun sinks below the horizon because light from the sun that strikes the atmosphere is scattered (both by the air itself and by suspended matter, e.g., dust and smoke). Civil twilight ends when the center of the sun is 6° below the horizon. Although it is still not very dark, it is necessary to use artificial light to carry out most activities. Nautical twilight ends when the sun's center is 12° below the horizon; at about this time the light is too dim for the user of a sextant to see a sharp horizon. Astronomical twilight ends when the sun's center is 18° below the horizon; by this time even the faintest stars overhead can be seen. (Similar definitions apply to morning twilight.) During twilight, Venus or Mercury is often seen as the evening star or morning star. The length of twilight depends on latitude and the time of year. Twilight is generally shorter at the equator, where the sun's path toward the horizon is more nearly vertical than at higher latitudes; typically, astronomical twilight may last for 1 hr at the equator and 11/2 hr in New York City.

Twilight is a borough in Washington County, Pennsylvania, United States. The population was 241 at the 2000 census.


Twilight is located at (40.114307, -79.890369).

According to the United States Census Bureau, the borough has a total area of 1.6 square miles (4.2 km²), all of it land.


As of the census of 2000, there were 241 people, 96 households, and 74 families residing in the borough. The population density was 149.9 people per square mile (57.8/km²). There were 103 housing units at an average density of 64.1/sq mi (24.7/km²). The racial makeup of the borough was 99.17% White and 0.83% African American.

There were 96 households out of which 29.2% had children under the age of 18 living with them, 66.7% were married couples living together, 8.3% had a female householder with no husband present, and 22.9% were non-families. 19.8% of all households were made up of individuals and 10.4% had someone living alone who was 65 years of age or older. The average household size was 2.51 and the average family size was 2.89.

In the borough the population was spread out with 19.9% under the age of 18, 4.6% from 18 to 24, 27.8% from 25 to 44, 28.6% from 45 to 64, and 19.1% who were 65 years of age or older. The median age was 43 years. For every 100 females there were 94.4 males. For every 100 females age 18 and over, there were 99.0 males.

The median income for a household in the borough was $40,833, and the median income for a family was $44,688. Males had a median income of $41,071 versus $22,813 for females. The per capita income for the borough was $22,236. About 7.5% of families and 10.5% of the population were below the poverty line, including 17.1% of those under the age of eighteen and none of those sixty five or over.


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