The text on the certificate contains a factual error regarding astronomy.
Step-by-step verification:
1.
Identify the claim: The certificate states, "In the 20th century, the International Astronomical Union (IAU) formally accepted the modern list of 88 constellations."
2.
Verify the facts: The International Astronomical Union (IAU) was founded in 1919. In 1922, at its first General Assembly, the IAU officially adopted the list of 88 constellations to standardize celestial mapping. It later defined their precise boundaries in 1930.
3.
Check the timeline: The years 1922 and 1930 fall within the 20th century (which spans from 1901 to 2000).
4.
Conclusion: The statement accurately reflects historical astronomical records.
Final Answer:
True
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