Are we about to see a rare green comet light up the sky? An expert explains what to expect from Comet Nishimura

Comet Nishimura is swinging past on its first visit in more than 400 years .

Nishimura 's path will keep it close to the sun in the sky as observed from Earth .

The best chance to see it from Australia comes in the week of Sept. 20 to 27 , when the comet's head will set around one hour after the sun.

The tail of the comet might still be visible as the sky darkens.

If you're lucky, you might spot the tail standing proud above the horizon.

If Nishimura doesn't turn out to be the show you hoped for, there's a chance another comet could put on a spectacular show next year .