<P> Although Helsinki, Oslo, Stockholm, Tallinn, and Saint Petersburg also enter into nautical twilight after sunset, they do have noticeably lighter skies at night during the summer solstice than other locations mentioned in their category above, because they do not go far into nautical twilight . A white night is a night with only civil twilight which lasts from sunset to sunrise . </P> <P> At the winter solstice within the polar circle, twilight can extend through solar noon at latitudes below 72.561 ° (72 ° 33 ′ 43") for civil twilight, 78.561 ° (78 ° 33 ′ 43") for nautical twilight, and 84.561 ° (84 ° 33 ′ 43") for astronomical twilight . </P> <P> Twilight on Mars is longer than on Earth, lasting for up to two hours before sunrise or after sunset . Dust high in the atmosphere scatters light to the night side of the planet . Similar twilights are seen on Earth following major volcanic eruptions . </P> <P> In Christian practice, "vigil" observances often occur during twilight on the evening before major feast days or holidays . For example, the Easter Vigil is held in the hours of darkness between sunset on Holy Saturday and sunrise on Easter Day--most commonly in the evening of Holy Saturday or midnight--and is the first celebration of Easter, days traditionally being considered to begin at sunset . </P>

What is the difference between twilight and sunset