First Solar Eclipse Photograph
Berkowski made the first solar eclipse photograph on July 28, 1851, also using the daguerrotype process, at the Royal Observatory in Königsberg, Prussia (now Kalinigrad in Russia). Berkowski, a local daguerrotypist whose first name was never published, observed at the Royal Observatory. A small 6-cm refracting telescope was attached to the 15.8-cm Fraunhofer heliometer and a 84-second exposure was taken shortly after the beginning of totality.
How many people do you know who can construct perfect polygons like a square, pentagon, or heptagon using only a compass and straightedge?
Broug Ateliers: Islamic Geometric Design: Learn: Polygons
How to draw a square with just a compass and a ruler
How to draw a pentagon with just a compass and a ruler
How to draw a heptagon with just a compass and a ruler
Author: Jean-Frédéric Schall (French, 1752-1825)
Date: ca. 1780-1820
Medium: Oil on panel
Location: Rijksmuseum, Amsterdam