"Sir Francis Drake's Astrolabe; an obsolete astronomical instrument of different forms, used for taking the altitude of the sun or stars, and for the solution of other problems in astronomy. "-Whitney, 1902.

Astrolabe

"Sir Francis Drake's Astrolabe; an obsolete astronomical instrument of different forms, used for taking…

"The ancient southern constellation of the River (Po or Padus)." -Whitney, 1911

Eridanus

"The ancient southern constellation of the River (Po or Padus)." -Whitney, 1911

"A zodiacal constellation, giving its name to a sign of the zodiac, lying east of Taurus, on the other side of the Milky Way." -Whitney, 1911

Gemini

"A zodiacal constellation, giving its name to a sign of the zodiac, lying east of Taurus, on the other…

"Observatory at Delhi."

Ancient Indian observatory

"Observatory at Delhi."

Claudius Ptolemaeus, known as Ptolemy, was an ancient geographer, astrologer, and astronomer.

Ptolemy

Claudius Ptolemaeus, known as Ptolemy, was an ancient geographer, astrologer, and astronomer.

Claudius Ptolemaeus, known as Ptolemy, was an ancient geographer, astrologer, and astronomer.

Ptolemy

Claudius Ptolemaeus, known as Ptolemy, was an ancient geographer, astrologer, and astronomer.

A diagram that shows constellations, seasons, equinoxes, solstices and astrological signs.

Seasons etc.

A diagram that shows constellations, seasons, equinoxes, solstices and astrological signs.

A transit telescope is a special purpose telescope mounted so as to allow it to be pointed only at objects in the sky crossing the local meridian, an event known as a transit. These telescopes rely on the rotation of the Earth to bring objects into their field of view.

Transit Telescope

A transit telescope is a special purpose telescope mounted so as to allow it to be pointed only at objects…

Zodiac of gold found at Cusco, Peru.

Zodiac

Zodiac of gold found at Cusco, Peru.

"The twelve signs of the zodiac, together with the Sun, and the Earth revolving around him. When the Earth is at A, the Sun will appear to be just entering the sign Aries, because then, when seen from the Earth, he ranges towards certain stars at the beginning of that constellation. When the Earth is at C, the Sun will appear in the opposite part of the heavens, and therefore in the beginning of Libra. The middle line, dividing the circle of the zodiac into equal parts, is the line of the ecliptic." —Comstock, 1850

Zodiac Signs

"The twelve signs of the zodiac, together with the Sun, and the Earth revolving around him. When the…