Humans have gazed at the night sky for thousands of years, and found it pretty interesting. They learned that you could navigate using the celestial map and, over time, also learned that certain events could be predicted. These learned people were quite prized by their brethren, and their endeavors helped advance our understanding of the world.

Last Name

Eise Eisinga

1744, Feb 211761-18111828, Aug 27
a Frisian amateur astronomer who built the Eise Eisinga Planetarium in his house in Franeker, Frisia Province in the Netherlands. The orrery still exists and is the oldest functioning planetarium in the world.
Links (1)

Cross-listed in Cartographers

Andrew Ellicott [2]

1754, Jan 241772-18171820, Aug 28
a U.S. surveyor who helped map many of the territories west of the Appalachians, surveyed the boundaries of the District of Columbia, continued and completed Pierre (Peter) Charles L'Enfant's work on the plan for Washington, D.C., and served as a teacher in survey methods for Meriwether Lewis. In 1770, his father, together with his uncles Andrew and John, pu...
Links (8)Notes (1)

Johann Franz Encke

1791, Sep 231816-18631865, Aug 26
a German astronomer. Among his activities, he worked on the calculation of the periods of comets and asteroids, measured the distance from the earth to the sun, and made observations of the planet Saturn.
Links (1)

Cross-listed in Scientists

Leonhard Euler

1707, Apr 151783, Sep 18
a Swiss mathematician, physicist, astronomer, logician and engineer who made important and influential discoveries in many branches of mathematics like infinitesimal calculus and graph theory while also making pioneering contributions to several branches such as topology and analytic number theory. He also introduced much of the modern mathematical terminolo...
Links (1)

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