Three Eclipses, A ‘Full Mars’ And A ‘Great Solstice Appulse’: What’s Left To See In The Sky In 2020 There's plenty going on in the sky in the second half of 2020—the closest 'Great Conjunction' of Jupiter and Saturn for 397 years is coming, but not before a brilliantly bright Mars, a few eclipses an a major meteor shower impress skywatchers.