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en.wikipedia.org/wiki/Equinox

An equinox is the moment in which the plane of Earth's equator passes through the center of the Sun's disk, which occurs twice each year, around 20 March and 23 September. On an equinox, day and night are of approximately equal duration all over .... These two effects combine to make the equinox day 12 h 7 min long and the ...

www.timeanddate.com/astronomy/equinox-not-equal.html

"Equinox" literally means "equal night", giving the impression that the night and day on the equinox are exactly the same length; 12 hours each. But this isn't ...

www.timeanddate.com/calendar/september-equinox.html

On the equinox, night and day are nearly exactly the same length – 12 hours – all over the world. This is the reason it's called an "equinox," derived from Latin, ...

earthsky.org/?p=196819

On the day of the equinox, the center of the sun would set about 12 hours ... yet retards the sunset, adding several minutes of daylight at each end of the day.

www.artscalendararticles.mysite.com

After the long nights of darkness in the winter, it is when the sun and moon divide ... so there are again 12 hours of daylight and darkness in the day for Jerusalem, ... distance all around the earth between the north and south poles, and divides ...

curious.astro.cornell.edu/about-us/161-our-solar-system/the-earth/day-night-cycle/195-is-the-sun-always-up-for-exactly-12-hours-at-the-equator-beginner

Jun 27, 2015 ... What is the length of day at the equator? ... It is always exactly 12 hours. ... In the Northern Hemisphere, the length of the day is longer during the months ... Why doesn't the length of each day change much around the solstices? ... is it possible for us to look into space and see light from Earth from long ago?

aa.usno.navy.mil/faq/docs/equinoxes.php

Jun 14, 2011 ... The dates on which day and night are each 12 hours occur a few days before and after the equinoxes. The specific dates of this occurrence are ...

www.weather.gov/cle/seasons

... Severe Weather · Fire Weather · Sun/Moon · Long Range Forecasts · Climate ... The "nearly" equal hours of day and night is due to refraction of sunlight or a ... to 12 hours and 8 minutes at 30 degrees latitude, to 12 hours and 16 minutes at 60 ... We all know that the Earth makes a complete revolution around the sun once ...

news.nationalgeographic.com/news/2004/03/0318_040318_equinox.html

Mar 20, 2006 ... But day is actually longer than night during an equinox. ... then the day and night of the equinox would each be exactly 12 hours long.

museumvictoria.com.au/planetarium/discoverycentre/faqs/when-is-nightime-the-same-length-as-daytime

Mar 19, 2010 ... Firstly, the equinox is not a day, but is a single moment in time. ... of daylight and 12 hours of night, because this day is not exactly 24 hours long! ... spring / northern autumn), all latitudes have equal hours of day and night.