Astronomy december 2020
Several celestial fireworks are set to explode in December, including a rare conjunction of Jupiter and Saturn that combines into one bright double planet. It should be visible in the sky after dark. Other highlights include a Geminid meteor shower peaking Sunday night/Monday morning and the winter solstice.
The moon reaches its first quarter phase on the 22nd. The lunar surface is ill-lit, making it difficult to see detail, but the lunar crescent will be easily visible in twilight and early evening.
A week later, a full moon takes center stage in the evening sky. This moon is much more observable than its November counterpart, because it’s not nearly as close to the sun. In fact, it’s the farthest away from the sun of any full moon in 2020. The moon will also be in a very good position to observe the Ursid meteor shower, which peaks on the 21st.
Astronomy december 2021
A rare spectacle will be unfolding in the western sky on the 21st – a conjunction of two giant planets. It will be hard to tell them apart to the naked eye. Look for them just after sunset as they appear to come together in the sky, and then slowly drift apart. It will be the closest they have been to each other since the Middle Ages, and the only time in our common era that this has happened.
If you don’t have a telescope, the best way to watch this event will be by using binoculars. The Lowell Observatory in Flagstaff will be livestreaming its views on their YouTube page, and the Virtual Telescope Project will share theirs on its website.
Another highlight of the month is a solar eclipse on the 14th, which will be visible from locations in southern Chile and Argentina. This is the last eclipse of the year, and totality will only occur over land.