Significados de periastron en inglés

I think they'll be adequate for anything that happens at periastron.

Not yet, but we're well past periastron now.

There was a project to provide shelters for the periastron storms set up ten years ago.

Mean they always acted this way at periastron?

Three days before periastron, they experienced a small earthquake, a thud followed by rumbling and groaning for about twenty seconds.

It seems that the government here knew all about the weather conditions they could expect at periastron, and had made plans for them.