18/12/2020
Bryce Canyon National Park
Today marks 57 years since the passage of the 1963 Clean Air Act, which was the first federal legislation regarding air pollution monitoring and control. Clean air here at Bryce Canyon isn't only essential for enjoying distant landforms and protecting life within the park, it's also key to astronomy and the enjoyment of our beautiful night skies--including a very special celestial event just around the corner.
For the next week, look off into the southwestern horizon shortly after the glow of the sunset has dissipated and see if you can spot two bright dots that are near one another (this photo from last night shows them just above the moon, though the moon will move from this area of the sky over the coming nights). These are the largest planets in our solar system--the brighter dot is Jupiter, and just above it to the left is Saturn. Follow these planets for the next few days and watch as they draw nearer and nearer until, on December 21st, they will appear to align. This is known as the Great Conjunction.
From our vantage point as inhabitants of planet Earth, Jupiter and Saturn cross paths every 20 years as they travel along their track around the Sun. So what makes this event so special? The last time that Jupiter and Saturn have aligned this closely during the night was nearly 800 years ago (the last conjunction where the planets were this close together was nearly 400 years ago but it occurred too close to the Sun to be visible)!
If you're in the park, you can come join us on December 21st to observe this rare cosmic event. Rangers will be at Yovimpa Point just after sunset to identify the location of the great conjunction, present constellation tours, and answer any other questions to fulfill your astronomical wonderings. Please bring warm layers, a mask, and your own pair of binoculars (if you have them) and arrive early as the spectacle will only be visible for a short period of time after the sun sets at 5:14 p.m.
Read more about Air Quality at Bryce Canyon: https://www.nps.gov/articles/airprofiles-brca.htm
Photo Jesse Gates
(jg)