by APOD Robot » Wed Mar 20, 2019 4:06 am
Equinox on Planet Earth
Explanation: Welcome to an
equinox on planet Earth. Today is the first day of spring in our fair planet's northern hemisphere, fall in the southern hemisphere, with day and night nearly equal around the globe. At an equinox
Earth's terminator, the dividing line between day and night, connects the planet's north and south poles as seen at the start of this remarkable
time-lapse video compressing an entire year into twelve seconds. To make it, the
Meteosat satellite recorded
these infrared images every day at the same local time from a geosynchronous orbit. The video actually starts at the September 2010 equinox with the terminator aligned vertically. As the
Earth revolves around the Sun, the
terminator tilts to provide less daily sunlight to the northern hemisphere, reaching the solstice and northern hemisphere winter at the maximum tilt. As the year continues, the terminator tilts back again and March 2011 equinox arrives halfway through the video. Then the terminator swings past vertical the other way, reaching the the June 2011 solstice and
the beginning of northern summer. The video ends as the
September equinox returns.
[url=https://apod.nasa.gov/apod/ap190320.html] [img]https://apod.nasa.gov/apod/calendar/S_190320.jpg[/img] [size=150]Equinox on Planet Earth[/size][/url]
[b] Explanation: [/b] Welcome to an [url=http://en.wikipedia.org/wiki/Equinox]equinox[/url] on planet Earth. Today is the first day of spring in our fair planet's northern hemisphere, fall in the southern hemisphere, with day and night nearly equal around the globe. At an equinox [url=http://en.wikipedia.org/wiki/Terminator_(solar)]Earth's terminator[/url], the dividing line between day and night, connects the planet's north and south poles as seen at the start of this remarkable [url=http://www.youtube.com/watch?v=LUW51lvIFjg]time-lapse video[/url] compressing an entire year into twelve seconds. To make it, the [url=http://en.wikipedia.org/wiki/Meteosat]Meteosat[/url] satellite recorded [url=http://earthobservatory.nasa.gov/IOTD/view.php?id=52248]these infrared images[/url] every day at the same local time from a geosynchronous orbit. The video actually starts at the September 2010 equinox with the terminator aligned vertically. As the [url=http://www.youtube.com/watch?v=q4_-R1vnJyw]Earth revolves[/url] around the Sun, the [url=https://apod.nasa.gov/apod/ap130406.html]terminator[/url] tilts to provide less daily sunlight to the northern hemisphere, reaching the solstice and northern hemisphere winter at the maximum tilt. As the year continues, the terminator tilts back again and March 2011 equinox arrives halfway through the video. Then the terminator swings past vertical the other way, reaching the the June 2011 solstice and [url=http://en.wikipedia.org/wiki/Seasons#Causes_and_effects]the beginning of[/url] northern summer. The video ends as the [url=https://apod.nasa.gov/apod/ap120923.html]September equinox[/url] returns.
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