Great time to see the Zodiacal light in twilight while there is no Moon – ln the evening in he Southern Hemisphere and morning in Northern hemisphere. Look to the West after Sun sets an you will a white triangular glow. It straddles the ecliptic – the line which the planet, Moon and Sun follow though the constellations of the Zodiac. It is a result of the scattering of sunlight though the interplanetary dust.

It is most visible in Spring and the autumn because this is the time when the ecliptic stands nearly straight up with respect to your western horizon just after true night falls in springtime months. Likewise, the zodiacal light is easiest to see before dawn in autumn because as the ecliptic is most perpendicular to your eastern horizon in the morning. That’s true no matter where you are on Earth.

Unlike true dawn or dusk, though, there’s no rosy color to the zodiacal light. The reddish skies at dawn and dusk are caused by Earth’s atmosphere, while the zodiacal light originates far outside our atmosphere, as explained below.

The darker your sky, the better your chances of seeing it. Your best bet is to pick a night when the moon is out of the sky, although it’s definitely possible, and very lovely, to see a slim crescent moon in the midst of this strange milky pyramid of light.

For both hemispheres, springtime is the best time to see the zodiacal light in the evening. Autumn is the best time to see it before dawn

People used to think zodiacal light originated somehow from phenomena in Earth’s upper atmosphere, but today we understand it as sunlight reflecting off dust grains that circle the Sun in the inner solar system. These grains are thought to be left over from the process that created our Earth and the other planets of our solar system 4.5 billion years ago.