Illustration of a square inscribed in a closed concave geometric figure with 24 sides in the shape of…

Illustration of an equilateral triangle inscribed in a closed concave geometric figure with 24 sides…

"The constellation Andromeda, including its stars down to 5th magnitude, according to Heis; the figure…

"An arrangement of rings, all circles of a single sphere, intended to show the relative positions of…

"Argent, on a chief, gules, two mullets, sable. The chief is an ordinary terminated by an horizontal…

Illustration of a 6-point star (convex dodecagon) circumscribed about a circle. This can also be described…

Illustration of an 8-point star (convex polygon) circumscribed about a circle. This can also be described…

Illustration of a 5-point star inscribed in a circle. This can also be described as a circle circumscribed…

Illustration of a 6-point star created by two equilateral triangles (often described as the Star of…

Illustration of a 6-point star (convex dodecagon) inscribed in a circle. This can also be described…

Illustration of an 8-point star, created by two squares at 45° rotations, inscribed in a circle.…

Illustration of an 8-point star, or convex polygon, inscribed in a circle. This can also be described…

Illustration of a 6-point star (convex dodecagon) inscribed in a large circle and circumscribed about…

Illustration of an 8-point star (convex polygon) inscribed in a large circle and circumscribed about…

A compass placed in some convenient part of a ship on the midship line and provided with vanes, screws,…

"CELESTIAL CROWN. Distinguished from any other crown by the stars on the points or rays that proceed…

A 5-point star made from a non-regular concave decagon in which all sides are equal in length.

Illustration of a 12-point star (24-sided polygon) inscribed in a regular dodecagon. This can also be…

A 6-point star made from a non-regular concave dodecagon in which all sides are equal in length. There…

"Two stars in the Big Dipper opposite the handle indicate the direction toward the North Star, which,…

"The observatory. This view is from the field, looking north. On the left is seen the winding Schuylkill,…

An illustration of drawing an eight point star using a series of pentagons to create a star. The paper…

Illustration of a non-regular decagonal prism in the shape of a star. Then ends/bases are made of star-shaped…

Illustration of a non-regular decagonal prism in the shape of a star. Then ends/bases are made of star-shaped…

Side view of a non-regular decagonal prism in the shape of a star. Then ends/bases are made of star-shaped…

A diagram showing the order of the universe as expounded by Ptolemy. Its basic concept surmises that…

"Divide the square as indicated by the dotted lines, drawing these as full lines in pencil, but do not…

"One standing at O will only see the half of the Sky which is above the circle NESW. The whole sky will…

The Greek square panel is found on the coffer of the Propylaea ceiling, the entrance to the Acropolis…

A problem exercise to creating a star using series of triangles and squares. The image is divided by…