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The Bortle dark-sky scale (usually referred to as simply the Bortle scale) is a nine-level numeric scale that measures the night sky's brightness of a particular location. It quantifies the astronomical observability of celestial objects and the interference caused by light pollution .
John E. Bortle is an American amateur astronomer. He is best known for creating the Bortle scale to quantify the darkness of the night sky. Bortle has made a special study of comets. He has recorded thousands of observations relating to more than 300 comets. From 1977 until 1994 he authored the monthly '"Comet Digest" in Sky and Telescope magazine.
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BRUSSELS (Reuters) -The United States doubled down on Friday on calls for a ceasefire in Gaza and the release of hostages following the death of Hamas' leader Yahya Sinwar, even as Israel and its ...
With a new moon, according to the Bortle scale, the star cannot be easily seen with the naked eye from polluted areas or with a full moon, but can be seen from suburban areas when overhead. [15] In the night sky, 68 Cygni is located west of the main asterism of Cygnus, approximately seven degrees east-southeast of the first-magnitude star Deneb ...
The Philadelphia 76ers' season might be cursed. Shams Charania of ESPN reported Thursday that Tyrese Maxey, one of the Sixers' stars, is expected to miss a "couple of weeks" with a right hamstring ...
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Terraria has support for mods, which is facilitated by the third-party tModLoader. [12] [13] [14] It later received official support when it was released as free downloadable content alongside the "Journey's End" update on Steam in 2020. [15] Mods for Terraria vary widely in their scope, content, and purpose. Some, such as Thorium and Calamity ...