Improved Ancient Instruments

Hipparchus

________ published a star catalog with more than 850 star positions.

Fakhri sextant

________ is 61⁄2- ft (2- m) wide.

15th century

Ptolemy's work was influential in the Islamic world until the ________, when the Mongol ruler Ulugh Beg demonstrated that many of the Almagest's data were incorrect.

Ulugh Beg

________ had a personal interest in astronomy, and it may have been this interest that led him to order the construction of the largest observatory in the history of the world after discovering significant errors in the Almagest's star positions.

Almagest

In the ________, Ptolemy publishes a star catalog that expands on Hipparchus's work and is regarded for more than a thousand years as the standard work on astronomy.

Zij i Sultani

________ also contained new measurements for the solar year, planetary motion, and the axial tilt of Earth.

Abd al Rahman al Sufi

________ adds the first references to galaxies in his star catalog.

Ulugh Beg

________, the grandson of Mongol conqueror Timur, was only 16 years old when he became ruler of the family's ancestral seat in Samarkand (modern- day Uzbekistan) in 1409.

Ptolemy

He publishes a star catalog that expands on Hipparchus's work and is regarded for more than a thousand years as the standard work on astronomy.

Abd al-Rahman al-Sufi

In 964 CE, he adds the first references to galaxies in his star catalog.

Tycho Brahe

______'s star catalog records a nova, demonstrating that the "fixed stars" do change and are not eternal.

standard authority

Ptolemy's Almagest was the world's _____ on star positions for over 1,000 years.

Ulugh Beg

The grandson of Mongol conqueror Timur, was only 16 years old when he became ruler of the family's ancestral seat in Samarkand (modern-day Uzbekistan) in 1409.

madrasa

Ulugh Beg established a new _____, an educational facility, and invited scholars from all over the world to study there in an effort to establish the city as a renowned center of learning.

1429

When was Ulugh Beg’s largest observatory finished building?

Hipparchus

Ptolemy’s catalog had largely been derived from the work of _____, and many of its star positions were not based on fresh observations.

Fakhri sextant

This sextant is 61⁄2-ft (2-m) wide.

north-south meridian

The Fakhri sextant was placed in a curved trench along the _____ and kept underground to protect it from earthquakes.

Zij-i Sultani

The Sultan’s Catalog of Stars

1437

Zij-i Sultani publication date

922

Of the 1,022 stars included in the Almagest, Ulugh Beg corrected the positions of ____.

1449

Ulugh Beg's death in _______ led to the observatory's destruction, and it wasn't until 1908 that it was discovered.

Ulugh Beg

It means Great Leader

130 BCE

Hipparchus published a star catalog with more than 850 star positions.

150 CE

In the Almagest, Ptolemy publishes a star catalog that expands on Hipparchus's work and is regarded for more than a thousand years as the standard work on astronomy.

964 CE

Abd al-Rahman al-Sufi adds the first references to galaxies in his star catalog.

1577

Tycho Brahe's star catalog records a nova, demonstrating that the "fixed stars" do change and are not eternal.