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Top astronomy events for September 2025<\/p>\n
From a total lunar eclipse to Saturn shining bright all night long, here are the top astronomy events to mark down on your September calendar.<\/p>\n
Saturn is about to make its closest approach to Earth, and that means you might be able to see its rings \u2014 if you have a telescope, that is.<\/p>\n
Here’s what to look for this weekend.<\/p>\n
When will Saturn be closest to Earth?<\/p>\n
On Sunday, Sept. 21, one day before the\u00a0official start of fall<\/a>, Saturn will be at what’s called “opposition,” which in\u00a0astronomical terms<\/a>\u00a0means the ringed planet will form a temporary line \u2014 the sun on one side and the Earth passing between them. Thanks to sunlight illuminating Saturn’s surface, it will appear exceptionally bright.<\/p>\n How close will Saturn get to Earth?<\/p>\n Earth’s outer planets are at their closest for the year during opposition, according to EarthSky<\/a>. Saturn will be approximately 795 million miles (1.28 billion kilometers) away from Earth.<\/p>\n How big is Saturn compared to Earth?<\/p>\n Saturn is roughly nine times wider than Earth, writes NASA<\/a>, with a diameter of about 74,897 miles. That means if Earth were the size of a nickel, Saturn would be as a big as a volleyball.<\/p>\n Where to spot Saturn in September 2025<\/p>\n Even if the weather doesn’t cooperate, Saturn should be visible all night in late September,\u00a0writes EarthSky<\/a>.<\/p>\n