Sites promising "Jean Meeus Astronomical Algorithms PDF Free" are often honey-pots for malware or phishing. Always use a reputable source. Modern Alternatives and Digital Libraries
If your primary goal is to use the algorithms for programming, many developers have created free, open-source libraries that implement Meeus’s formulas legally:
You can often "borrow" a digital copy for free for 1-14 days. This is the safest way to read the full text online without a purchase.
“Besides astronomy developers of software for smartphone or solar power may also find this book very useful.” Goodreads
These sites do not replace the depth of Meeus’s explanations, but they enable you to experiment with the same calculations and verify your own implementations.