An unusual triangle of light will be particularly bright near the eastern horizon before sunrise during the next two months for observers in Earth's northern hemisphere. Once considered a false dawn [ http://www.odysseym…], this triangle of light is actually Zodiacal Light [ http://home.wanadoo…], light reflected from interplanetary dust particles [ http://antwrp.gsfc.…]. The triangle is clearly visible on the left of the above frame taken from Mauna Kea [ http://www.ifa.hawa…] in Hawaii [ http://www.state.hi…] on August 30 by one of the developing global network of fisheye nighttime web cameras [ http://concam.net/] called CONCAMs [ http://concam.net/a…]. Zodiacal dust [ http://stardust.wus…] orbits the Sun [ http://www.nineplan…] predominantly in the same plane as the planets: the ecliptic [ http://antwrp.gsfc.…]. Indeed, the triangle points to bright spots Jupiter and Saturn [ http://antwrp.gsfc.…], with Saturn [ http://antwrp.gsfc.…] nearer the center. Zodiacal light [ http://www.as.wvu.e…] is so bright this time of year because the dust band [ http://antwrp.gsfc.…] is oriented nearly vertical at sunrise, so that the thick air near the horizon does not block [ http://www.earthsky…] out relatively bright reflecting [ http://sirtf.jpl.na…] dust. Zodiacal light [ http://antwrp.gsfc.…] is also bright for people in Earth's northern hemisphere in March and April just after sunset.
Explanation
An unusual triangle of light will be particularly bright near the eastern horizon before sunrise during the next two months for observers in Earth's northern hemisphere. Once considered a false dawn [ http://www.odysseym…], this triangle of light is actually Zodiacal Light [ http://home.wanadoo…], light reflected from interplanetary dust particles [ http://antwrp.gsfc.…]. The triangle is clearly visible on the left of the above frame taken from Mauna Kea [ http://www.ifa.hawa…] in Hawaii [ http://www.state.hi…] on August 30 by one of the developing global network of fisheye nighttime web cameras [ http://concam.net/] called CONCAMs [ http://concam.net/a…]. Zodiacal dust [ http://stardust.wus…] orbits the Sun [ http://www.nineplan…] predominantly in the same plane as the planets: the ecliptic [ http://antwrp.gsfc.…]. Indeed, the triangle points to bright spots Jupiter and Saturn [ http://antwrp.gsfc.…], with Saturn [ http://antwrp.gsfc.…] nearer the center. Zodiacal light [ http://www.as.wvu.e…] is so bright this time of year because the dust band [ http://antwrp.gsfc.…] is oriented nearly vertical at sunrise, so that the thick air near the horizon does not block [ http://www.earthsky…] out relatively bright reflecting [ http://sirtf.jpl.na…] dust. Zodiacal light [ http://antwrp.gsfc.…] is also bright for people in Earth's northern hemisphere in March and April just after sunset.
