Just after sunset this weekend, the sky will put on a spectacular show.

Mercury, Venus, Mars and Jupiter, aligned over the southern hemisphere in May. (AP)

The last major alignment of the planets happened in May, when the southern hemisphere was treated with a foursome — Mercury, Venus, Mars and Jupiter all aligned.

At the time, Fred Watson, an astronomer at the Anglo-Australian Observatory, said the planetary show may not be rivaled for another 29 years.

But this weekend’s show could prove Watson wrong.

If your local weather forecasts clouds or rain, you can still watch the event streaming online.