by APOD Robot » Mon Jun 24, 2019 4:10 am
Anticrepuscular Rays Converge Opposite the Sun
Explanation: Is there ever anything interesting to see in the direction
opposite the Sun? Sometimes there is. Notable items include
your own shadow, a
shadow of the Moon during a total solar eclipse, a
full moon --
in eclipse if the alignment's good enough, a
full earth,
planets at opposition,
glints from
planets,
the gegenschein from interplanetary dust, the
center of a rainbow,
hall-of-mountain fogbows, an
airplane glory, and something
yet again different if your timing, clouds and Sun position are
just right. This different effect starts with clouds near the
Sun that are causing common
crepuscular rays to stream though. In the featured rare image taken from an airplane in mid-April,
these beams were caught converging
180 degrees around, on the opposite side of the sky from the Sun, where they are called
anticrepuscular rays. Therefore, it may look like
something bright is shining at the
antisolar point near the image center, but actually it is
reverse-shining because, from your direction, light is streaming in, not out.
[url=https://apod.nasa.gov/apod/ap190624.html] [img]https://apod.nasa.gov/apod/calendar/S_190624.jpg[/img] [size=150]Anticrepuscular Rays Converge Opposite the Sun[/size][/url]
[b] Explanation: [/b] Is there ever anything interesting to see in the direction [i] opposite [/i] the Sun? Sometimes there is. Notable items include [url=https://apod.nasa.gov/apod/ap140823.html]your own shadow[/url], a [url=https://apod.nasa.gov/apod/ap110102.html]shadow of the Moon[/url] during a total solar eclipse, a [url=https://apod.nasa.gov/apod/ap190618.html]full moon[/url] -- [url=https://apod.nasa.gov/apod/ap180807.html]in eclipse[/url] if the alignment's good enough, a [url=https://apod.nasa.gov/apod/ap130928.html]full earth[/url], [url=https://apod.nasa.gov/apod/ap180727.html]planets[/url] [url=https://apod.nasa.gov/apod/ap180503.html]at[/url] [url=https://apod.nasa.gov/apod/ap170617.html]opposition[/url], [url=https://apod.nasa.gov/apod/ap980608.html]glints[/url] from [url=https://apod.nasa.gov/apod/ap170717.html]planets[/url], [url=https://apod.nasa.gov/apod/ap140114.html]the gegenschein[/url] from interplanetary dust, the [url=https://apod.nasa.gov/apod/ap140930.html]center of a rainbow[/url], [url=https://apod.nasa.gov/apod/ap100504.html]hall-of-mountain fogbows[/url], an [url=https://apod.nasa.gov/apod/ap161222.html]airplane glory[/url], and something [url=https://usercontent1.hubstatic.com/13756696_f496.jpg]yet again different[/url] if your timing, clouds and Sun position are [url=https://apod.nasa.gov/apod/ap180624.html]just right[/url]. This different effect starts with clouds near the [url=https://solarsystem.nasa.gov/solar-system/sun/overview/]Sun[/url] that are causing common [url=https://apod.nasa.gov/apod/ap050831.html]crepuscular rays[/url] to stream though. In the featured rare image taken from an airplane in mid-April, [url=https://www.atoptics.co.uk/atoptics/rayform.htm]these beams[/url] were caught converging [url=https://www.atoptics.co.uk/atoptics/skywide.htm]180 degrees around[/url], on the opposite side of the sky from the Sun, where they are called [url=https://apod.nasa.gov/apod/ap101128.html][i]anti[/i]crepuscular rays[/url]. Therefore, it may look like [url=https://en.wikipedia.org/wiki/Anticrepuscular_rays]something[/url] bright is shining at the [url=https://en.wikipedia.org/wiki/Antisolar_point]antisolar point[/url] near the image center, but actually it is [url=https://www.atoptics.co.uk/atoptics/anti1.htm]reverse-shining[/url] because, from your direction, light is streaming in, not out.
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