December 2025 offers a packed skywatching calendar for observers in the Toronto area. From a final supermoon of the year to the Geminid meteor shower and a rare interstellar comet, there’s plenty to see. The Winter Solstice brings the longest nights, giving stargazers ample time to enjoy bright planets, sparkling winter constellations, and multiple meteor showers. Below is a comprehensive guide (with times in local EST) to all the notable celestial events this month – including where and when to look for each. Let’s explore what’s happening in the sky this December 2025!