Ulugh Beg and Maragheh are

Question

BlackTom AI · Accepted Answer

Ulugh Beg and Maragheh are both historic major observatories that produced influential astronomical observations and star catalogues.

1) Relevant knowledge points and concepts
- Ulugh Beg (1394–1449) was a Timurid ruler and astronomer who built the Samarkand Observatory (early 15th century). Its astronomers compiled the Zij-i Sultani, a highly accurate star catalogue and positional astronomy work using large instruments (e.g., a massive sextant).
- The Maragheh Observatory was founded in 1259 by Nasir al‑Din al‑Tusi under the patronage of the Ilkhanid ruler Hulagu. It became a leading center for astronomical observation and calculation and produced the Zij-i Ilkhani and other important works. Maragheh hosted large instruments and teams that advanced planetary theory and instrument design.

2) Step-by-step reasoning
- Identify each name: Ulugh Beg refers to both the ruler/astronomer and the observatory he established at Samarkand; Maragheh refers to the observatory complex at Maragheh (not a person).
- Compare to the answer choices: the places are clearly institutions for observing the sky, not “royal stars” (which are specific fixed stars in Persian tradition), not texts by al‑Khwarizmi (he lived centuries earlier and wrote different works), and not two individual astronomers (only Ulugh Beg was a person; Maragheh is a place/observatory).
- Historical evidence: both sites produced Zij catalogues and precise positional data, showing they were observatories where significant progress in science and astronomy occurred.

3) Calculations/intermediate steps
- Not applicable (historical reasoning rather than numeric calculation).

4) Why the correct answer is correct
- Both Ulugh Beg (Samarkand Observatory) and Maragheh Observatory are well-documented medieval observatories whose instrumentation, observations, and catalogues significantly advanced astronomy in the Islamic world and influenced later European developments.

5) Why other options are incorrect
- “Two of the royal stars of Persia”: incorrect—those are four specific stars (e.g., Aldebaran), not these institutions.
- “Two of the texts written by al‑Khwarizmi”: incorrect—al‑Khwarizmi wrote earlier foundational works, not these named observatories.
- “Two of the most prominent astronomers”: incorrect—Ulugh Beg was an astronomer, but Maragheh is an observatory/place, not a person.

Conclusion: The correct answer is “ancient observatories where significant progress in science and astronomy were made,” which matches the provided answer.

Ulugh Beg and Maragheh are Single choice

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