Discover if the Askar SQA55 lives up to its reputation as the best small astrograph on the market. We break down its features, performance, and value for astrophotography enthusiasts. #AskarSQA55 ...
The United States Naval Observatory (USNO) has released the Fourth Edition of its USNO CCD Astrograph Catalog (UCAC4), the most precise and comprehensive star catalog ever produced by ground-based ...
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