Just after sunset on Sunday, Jupiter, Saturn, and Mercury will have a rare triple conjunction, coming close together from our perspective. The trio will form a small, clear triangle low in the southwest sky with Jupiter sitting at the top of their planetary pyramid. The planets will actually be near each other each night from January 8 through January 11, but the tightest group will happen on January 10, per EarthSky. Though, you should look right away, because they won't stay above the horizon for long.