Thousands of protesters will discover whether they can rally at an iconic Australian landmark as a trio of judges rule on the legality of a pro-Palestine demonstration.

Police have challenged the Palestine Action Group's proposed protest in the NSW Court of Appeal.

Organisers believe Sunday's march, if approved, will see around 40,000 people wind through Sydney's city centre to the forecourt of the Sydney Opera House, according to organisers.

That number is why police believe it is inappropriate.

The judges, who are due to deliver a decision on Thursday, have also raised concerns over crowd safety during earlier hearings.

Comparing the protest to a massive August rally at the Sydney Harbour Bridge, where between 90,000 and 300,000 marched in the rain, Chief Justice Andrew Bell said ev

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