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 lucassifoni.info
Lucas Sifoni - 2024 amateur optics / astronomy updates
| | 11011110.github.io
Astronomy links
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| | Continuing to clear out old bookmarks: astronomy and astrophysics this time.
| | www.planetary.org
Astronomy for Beginners | The Planetary Society
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| | An introduction to backyard astronomy for amateur stargazers.
| | amazingsky.net
My 2025 Sky Calendar - The Amazing Sky
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| | It's published! My 2025 Amazing Sky Calendar is out and available for FREE! as a downloadable PDF. Please go to my website at https://www.amazingsky.com/Books for the details and the download link. The PDF can be printed at home. It is designed to be printed landscape mode at 13x10-inches, but will work printed 11x8.5-inches. Office supply...
| | www.livescience.com
How many times has Earth orbited the sun? | Live Science
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| We worked out how many trips each of the solar system's eight planets has taken around the sun over the past 4.6 billion years.