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The beauty of winter 2021 | Today's Image


Posted by EarthSky in Today s Image |
January 29, 2021
We share your best photos of winter 2021!
View at EarthSky Community Photos. | Niccole Neely in Arizona captured this photo of snow-covered saguaros on January 25, 2021. She wrote: “I live in Phoenix, Arizona, and a recent storm brought snow to the outskirts of Phoenix and northern Arizona. It was truly amazing to see our saguaros covered in snow. It was a desert winter wonderland!” Thanks, Niccole!
Winter has descended on the Northern Hemisphere, and places as far south as Arizona are seeing snow. Friends of EarthSky are sharing their photos with us, from unusual ice features to thick powdery blankets. Share your best shot of winter at EarthSky Community Photos! ....

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What are degrees, arc minutes and arc seconds? | Astronomy Essentials


January 8, 2021
How do skywatchers measure distances in the night sky? Here’s how to understand it when they speak of objects as being several degrees (or several arc minutes or arc seconds) apart.
Use this “handy” guide to measure degrees on the dome of the sky. Image via Fort Worth Astronomical Society.
The handiest measuring stick for the sky’s dome is the one on the end of your arm. You can use the width of your pinky, fist and more to gauge the distance between sky objects. That comes in handy when you’re observing conjunctions between planets, or close planets and stars, or planets and stars and the moon, plus many other space objects. You’ll often find these objects described as being a certain number of degrees, arc minutes or arc seconds apart. ....

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